Sasi Math (Revised for 1024)

Scroll:Measurements >> Circle >> saq (4479)

Written Instructions:

For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..

For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.

Leave your answers in the simplest form or correct to two decimal places.

Find the circumference of a circle whose radius is 2.1m

___m

Answer:_______________

Find the circumference of a circle whose radius is 12.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 63cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 3.5m

___m

Answer:_______________

Find the circumference of a circle whose radius is 22.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 84cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 4.9m

___m

Answer:_______________

Find the circumference of a circle whose radius is 23.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 70cm

___cm

Answer:_______________

10)

Find the circumference of a circle whose radius is 3.5m

___m

Answer:_______________

Find the circumference of a circle whose radius is 6.3m

Answer: 39.6m

SOLUTION 1 :

Given,

r = 6.3m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 6.3

= 2 x 22 /7 x ~~6.3~~^0.9

= 44 x 0.9

= 39.6 m

Circumference of circle is 39.6m.

Find the circumference of a circle whose radius is 12.1cm

Answer: 74.8cm

SOLUTION 1 :

Given,

r = 12.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 12.1

= 2 x 22 /7 x ~~12.1~~^1.7

= 44 x 1.7

= 74.8 cm

Circumference of circle is 74.8cm.

Find the circumference of a circle whose radius is 63cm

Answer: 396cm

SOLUTION 1 :

Given,

r = 63cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 63

= 2 x 22 /7 x 63⁹

= 44 x 9

= 396 cm

Circumference of circle is 396cm.

Find the circumference of a circle whose radius is 2.1m

Answer: 13.2m

SOLUTION 1 :

Given,

r = 2.1m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 2.1

= 2 x 22 /7 x ~~2.1~~^0.3

= 44 x 0.3

= 13.2 m

Circumference of circle is 13.2m.

Find the circumference of a circle whose radius is 22.1cm

Answer: 140.8cm

SOLUTION 1 :

Given,

r = 22.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 22.1

= 2 x 22 /7 x ~~22.1~~^3.2

= 44 x 3.2

= 140.8 cm

Circumference of circle is 140.8cm.

Find the circumference of a circle whose radius is 84cm

Answer: 528cm

SOLUTION 1 :

Given,

r = 84cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 84

= 2 x 22 /7 x 84¹²

= 44 x 12

= 528 cm

Circumference of circle is 528cm.

Find the circumference of a circle whose radius is 2.8m

Answer: 17.6m

SOLUTION 1 :

Given,

r = 2.8m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 2.8

= 2 x 22 /7 x ~~2.8~~^0.4

= 44 x 0.4

= 17.6 m

Circumference of circle is 17.6m.

Find the circumference of a circle whose radius is 23.1cm

Answer: 145.2cm

SOLUTION 1 :

Given,

r = 23.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 23.1

= 2 x 22 /7 x ~~23.1~~^3.3

= 44 x 3.3

= 145.2 cm

Circumference of circle is 145.2cm.

Find the circumference of a circle whose radius is 70cm

Answer: 440cm

SOLUTION 1 :

Given,

r = 70cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 70

= 2 x 22 /7 x 70¹⁰

= 44 x 10

= 440 cm

Circumference of circle is 440cm.

10)

Find the circumference of a circle whose radius is 4.2m

Answer: 26.4m

SOLUTION 1 :

Given,

r = 4.2m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 4.2

= 2 x 22 /7 x ~~4.2~~^0.6

= 44 x 0.6

= 26.4 m

Circumference of circle is 26.4m.