The figure is made up of 3 semi-circles with diameter of 28 cm, 56 cm and 84 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

84 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 8 cm, 16 cm and 24 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

24 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 44 cm, 88 cm and 132 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

132 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 36 cm, 72 cm and 108 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

108 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 20 cm, 40 cm and 60 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

60 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 40 cm, 80 cm and 120 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

120 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 24 cm, 48 cm and 72 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

72 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 16 cm, 32 cm and 48 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

48 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 60 cm, 120 cm and 180 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

180 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 12 cm, 24 cm and 36 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

36 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 28 cm, 56 cm and 84 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

84 cm

Answer: 1232 cm²

Answer: 132 cm

Step 1: Radius of big semi-circle → 84 ÷ 2

                                                      = 42 cm

Step 2: Radius of medium semi-circe → 56 ÷ 2

                                                            = 28 cm

Step 3: Radius of small semi-circle → 84 ÷ 2

                                                         = 14 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 42 cm x 42 cm

                                                 = 2771.244 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 28 cm x 28 cm

                                                         = 1231.664 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 14 cm x 14 cm

                                            = 307.916 cm²

Step 7: Area of the shaded part → 2771.244 cm² - 1231.664 cm² - 307.916 cm²

                                                    = 1231.664 cm²

                                                    ≈ 1232 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 84 cm

                                                                 = 65.982 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 56 cm

                                                                         = 43.988 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 28 cm

                                                                     = 21.994 cm

Step 11: Perimeter of shaded part → 65.982 cm + 43.988 cm + 21.994 cm

                                                       = 131.964 cm

                                                       ≈ 132 cm

The figure is made up of 3 semi-circles with diameter of 8 cm, 16 cm and 24 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

24 cm

Answer: 101 cm²

Answer: 38 cm

Step 1: Radius of big semi-circle → 24 ÷ 2

                                                      = 12 cm

Step 2: Radius of medium semi-circe → 16 ÷ 2

                                                            = 8 cm

Step 3: Radius of small semi-circle → 24 ÷ 2

                                                         = 4 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

                                                 = 226.224 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 8 cm x 8 cm

                                                         = 100.544 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 4 cm x 4 cm

                                            = 25.136 cm²

Step 7: Area of the shaded part → 226.224 cm² - 100.544 cm² - 25.136 cm²

                                                    = 100.544 cm²

                                                    ≈ 101 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 24 cm

                                                                 = 18.852 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 16 cm

                                                                         = 12.568 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 8 cm

                                                                     = 6.284 cm

Step 11: Perimeter of shaded part → 18.852 cm + 12.568 cm + 6.284 cm

                                                       = 37.704 cm

                                                       ≈ 38 cm

The figure is made up of 3 semi-circles with diameter of 44 cm, 88 cm and 132 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

132 cm

Answer: 3041 cm²

Answer: 207 cm

Step 1: Radius of big semi-circle → 132 ÷ 2

                                                      = 66 cm

Step 2: Radius of medium semi-circe → 88 ÷ 2

                                                            = 44 cm

Step 3: Radius of small semi-circle → 132 ÷ 2

                                                         = 22 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 66 cm x 66 cm

                                                 = 6843.276 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 44 cm x 44 cm

                                                         = 3041.456 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 22 cm x 22 cm

                                            = 760.364 cm²

Step 7: Area of the shaded part → 6843.276 cm² - 3041.456 cm² - 760.364 cm²

                                                    = 3041.456 cm²

                                                    ≈ 3041 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 132 cm

                                                                 = 103.686 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 88 cm

                                                                         = 69.124 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 44 cm

                                                                     = 34.562 cm

Step 11: Perimeter of shaded part → 103.686 cm + 69.124 cm + 34.562 cm

                                                       = 207.372 cm

                                                       ≈ 207 cm

The figure is made up of 3 semi-circles with diameter of 36 cm, 72 cm and 108 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

108 cm

Answer: 2036 cm²

Answer: 170 cm

Step 1: Radius of big semi-circle → 108 ÷ 2

                                                      = 54 cm

Step 2: Radius of medium semi-circe → 72 ÷ 2

                                                            = 36 cm

Step 3: Radius of small semi-circle → 108 ÷ 2

                                                         = 18 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 54 cm x 54 cm

                                                 = 4581.036 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 36 cm x 36 cm

                                                         = 2036.016 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 18 cm x 18 cm

                                            = 509.004 cm²

Step 7: Area of the shaded part → 4581.036 cm² - 2036.016 cm² - 509.004 cm²

                                                    = 2036.016 cm²

                                                    ≈ 2036 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 108 cm

                                                                 = 84.834 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 72 cm

                                                                         = 56.556 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 36 cm

                                                                     = 28.278 cm

Step 11: Perimeter of shaded part → 84.834 cm + 56.556 cm + 28.278 cm

                                                       = 169.668 cm

                                                       ≈ 170 cm

The figure is made up of 3 semi-circles with diameter of 20 cm, 40 cm and 60 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

60 cm

Answer: 628 cm²

Answer: 94 cm

Step 1: Radius of big semi-circle → 60 ÷ 2

                                                      = 30 cm

Step 2: Radius of medium semi-circe → 40 ÷ 2

                                                            = 20 cm

Step 3: Radius of small semi-circle → 60 ÷ 2

                                                         = 10 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 30 cm x 30 cm

                                                 = 1413.900 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 20 cm x 20 cm

                                                         = 628.400 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 10 cm x 10 cm

                                            = 157.100 cm²

Step 7: Area of the shaded part → 1413.900 cm² - 628.400 cm² - 157.100 cm²

                                                    = 628.400 cm²

                                                    ≈ 628 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 60 cm

                                                                 = 47.130 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 40 cm

                                                                         = 31.420 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 20 cm

                                                                     = 15.710 cm

Step 11: Perimeter of shaded part → 47.130 cm + 31.420 cm + 15.710 cm

                                                       = 94.260 cm

                                                       ≈ 94 cm

The figure is made up of 3 semi-circles with diameter of 40 cm, 80 cm and 120 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

120 cm

Answer: 2514 cm²

Answer: 189 cm

Step 1: Radius of big semi-circle → 120 ÷ 2

                                                      = 60 cm

Step 2: Radius of medium semi-circe → 80 ÷ 2

                                                            = 40 cm

Step 3: Radius of small semi-circle → 120 ÷ 2

                                                         = 20 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 60 cm x 60 cm

                                                 = 5655.600 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 40 cm x 40 cm

                                                         = 2513.600 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 20 cm x 20 cm

                                            = 628.400 cm²

Step 7: Area of the shaded part → 5655.600 cm² - 2513.600 cm² - 628.400 cm²

                                                    = 2513.600 cm²

                                                    ≈ 2514 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 120 cm

                                                                 = 94.260 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 80 cm

                                                                         = 62.840 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 40 cm

                                                                     = 31.420 cm

Step 11: Perimeter of shaded part → 94.260 cm + 62.840 cm + 31.420 cm

                                                       = 188.520 cm

                                                       ≈ 189 cm

The figure is made up of 3 semi-circles with diameter of 24 cm, 48 cm and 72 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

72 cm

Answer: 905 cm²

Answer: 113 cm

Step 1: Radius of big semi-circle → 72 ÷ 2

                                                      = 36 cm

Step 2: Radius of medium semi-circe → 48 ÷ 2

                                                            = 24 cm

Step 3: Radius of small semi-circle → 72 ÷ 2

                                                         = 12 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 36 cm x 36 cm

                                                 = 2036.016 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 24 cm x 24 cm

                                                         = 904.896 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

                                            = 226.224 cm²

Step 7: Area of the shaded part → 2036.016 cm² - 904.896 cm² - 226.224 cm²

                                                    = 904.896 cm²

                                                    ≈ 905 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 72 cm

                                                                 = 56.556 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 48 cm

                                                                         = 37.704 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 24 cm

                                                                     = 18.852 cm

Step 11: Perimeter of shaded part → 56.556 cm + 37.704 cm + 18.852 cm

                                                       = 113.112 cm

                                                       ≈ 113 cm

The figure is made up of 3 semi-circles with diameter of 16 cm, 32 cm and 48 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

48 cm

Answer: 402 cm²

Answer: 75 cm

Step 1: Radius of big semi-circle → 48 ÷ 2

                                                      = 24 cm

Step 2: Radius of medium semi-circe → 32 ÷ 2

                                                            = 16 cm

Step 3: Radius of small semi-circle → 48 ÷ 2

                                                         = 8 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 24 cm x 24 cm

                                                 = 904.896 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 16 cm x 16 cm

                                                         = 402.176 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 8 cm x 8 cm

                                            = 100.544 cm²

Step 7: Area of the shaded part → 904.896 cm² - 402.176 cm² - 100.544 cm²

                                                    = 402.176 cm²

                                                    ≈ 402 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 48 cm

                                                                 = 37.704 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 32 cm

                                                                         = 25.136 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 16 cm

                                                                     = 12.568 cm

Step 11: Perimeter of shaded part → 37.704 cm + 25.136 cm + 12.568 cm

                                                       = 75.408 cm

                                                       ≈ 75 cm

The figure is made up of 3 semi-circles with diameter of 60 cm, 120 cm and 180 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

180 cm

Answer: 5656 cm²

Answer: 283 cm

Step 1: Radius of big semi-circle → 180 ÷ 2

                                                      = 90 cm

Step 2: Radius of medium semi-circe → 120 ÷ 2

                                                            = 60 cm

Step 3: Radius of small semi-circle → 180 ÷ 2

                                                         = 30 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 90 cm x 90 cm

                                                 = 12725.100 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 60 cm x 60 cm

                                                         = 5655.600 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 30 cm x 30 cm

                                            = 1413.900 cm²

Step 7: Area of the shaded part → 12725.100 cm² - 5655.600 cm² - 1413.900 cm²

                                                    = 5655.600 cm²

                                                    ≈ 5656 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 180 cm

                                                                 = 141.390 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 120 cm

                                                                         = 94.260 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 60 cm

                                                                     = 47.130 cm

Step 11: Perimeter of shaded part → 141.390 cm + 94.260 cm + 47.130 cm

                                                       = 282.780 cm

                                                       ≈ 283 cm

The figure is made up of 3 semi-circles with diameter of 12 cm, 24 cm and 36 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

36 cm

Answer: 226 cm²

Answer: 57 cm

Step 1: Radius of big semi-circle → 36 ÷ 2

                                                      = 18 cm

Step 2: Radius of medium semi-circe → 24 ÷ 2

                                                            = 12 cm

Step 3: Radius of small semi-circle → 36 ÷ 2

                                                         = 6 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 18 cm x 18 cm

                                                 = 509.004 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

                                                         = 226.224 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 6 cm x 6 cm

                                            = 56.556 cm²

Step 7: Area of the shaded part → 509.004 cm² - 226.224 cm² - 56.556 cm²

                                                    = 226.224 cm²

                                                    ≈ 226 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 36 cm

                                                                 = 28.278 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 24 cm

                                                                         = 18.852 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 12 cm

                                                                     = 9.426 cm

Step 11: Perimeter of shaded part → 28.278 cm + 18.852 cm + 9.426 cm

                                                       = 56.556 cm

                                                       ≈ 57 cm