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 1.4m

___m

Answer:_______________

Find the circumference of a circle whose radius is 16.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 77cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 4.9m

___m

Answer:_______________

Find the circumference of a circle whose radius is 30.1cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 70cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 3.5m

___m

Answer:_______________

Find the circumference of a circle whose radius is 27.1cm

___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 1.4m

Answer: 8.8m

SOLUTION 1 :

Given,

r = 1.4m

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 1.4

= 2 x 22 /7 x ~~1.4~~^0.2

= 44 x 0.2

= 8.8 m

Circumference of circle is 8.8m.

Find the circumference of a circle whose radius is 16.1cm

Answer: 101.2cm

SOLUTION 1 :

Given,

r = 16.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 16.1

= 2 x 22 /7 x ~~16.1~~^2.3

= 44 x 2.3

= 101.2 cm

Circumference of circle is 101.2cm.

Find the circumference of a circle whose radius is 77cm

Answer: 484cm

SOLUTION 1 :

Given,

r = 77cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 77

= 2 x 22 /7 x 77¹¹

= 44 x 11

= 484 cm

Circumference of circle is 484cm.

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.

Find the circumference of a circle whose radius is 30.1cm

Answer: 189.2cm

SOLUTION 1 :

Given,

r = 30.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 30.1

= 2 x 22 /7 x ~~30.1~~^4.3

= 44 x 4.3

= 189.2 cm

Circumference of circle is 189.2cm.

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.

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 27.1cm

Answer: 171.6cm

SOLUTION 1 :

Given,

r = 27.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 27.1

= 2 x 22 /7 x ~~27.1~~^3.9

= 44 x 3.9

= 171.6 cm

Circumference of circle is 171.6cm.

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 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.