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 3.5m

___m

Answer:_______________

Find the circumference of a circle whose radius is 26.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 42cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 2.8m

___m

Answer:_______________

Find the circumference of a circle whose radius is 20.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 35cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 1.4m

___m

Answer:_______________

Find the circumference of a circle whose radius is 10.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 91cm

___cm

Answer:_______________

10)

Find the circumference of a circle whose radius is 4.9m

___m

Answer:_______________

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.

Find the circumference of a circle whose radius is 26.1cm

Answer: 162.8cm

SOLUTION 1 :

Given,

r = 26.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 26.1

= 2 x 22 /7 x ~~26.1~~^3.7

= 44 x 3.7

= 162.8 cm

Circumference of circle is 162.8cm.

Find the circumference of a circle whose radius is 42cm

Answer: 264cm

SOLUTION 1 :

Given,

r = 42cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 42

= 2 x 22 /7 x 42⁶

= 44 x 6

= 264 cm

Circumference of circle is 264cm.

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 20.1cm

Answer: 127.6cm

SOLUTION 1 :

Given,

r = 20.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 20.1

= 2 x 22 /7 x ~~20.1~~^2.9

= 44 x 2.9

= 127.6 cm

Circumference of circle is 127.6cm.

Find the circumference of a circle whose radius is 35cm

Answer: 220cm

SOLUTION 1 :

Given,

r = 35cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 35

= 2 x 22 /7 x 35⁵

= 44 x 5

= 220 cm

Circumference of circle is 220cm.

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 10.1cm

Answer: 61.6cm

SOLUTION 1 :

Given,

r = 10.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 10.1

= 2 x 22 /7 x ~~10.1~~^1.4

= 44 x 1.4

= 61.6 cm

Circumference of circle is 61.6cm.

Find the circumference of a circle whose radius is 91cm

Answer: 572cm

SOLUTION 1 :

Given,

r = 91cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 91

= 2 x 22 /7 x 91¹³

= 44 x 13

= 572 cm

Circumference of circle is 572cm.

10)

Find the circumference of a circle whose radius is 5.6m

Answer: 35.2m

SOLUTION 1 :

Given,

r = 5.6m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 5.6

= 2 x 22 /7 x ~~5.6~~^0.8

= 44 x 0.8

= 35.2 m

Circumference of circle is 35.2m.