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 42cm

___cm

Answer:_______________

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 98cm

___cm

Answer:_______________

Find the circumference of a circle whose radius is 2.1m

___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 6.3m

___m

Answer:_______________

Find the circumference of a circle whose radius is 11.1cm

___cm

Answer:_______________

10)

Find the circumference of a circle whose radius is 35cm

___cm

Answer:_______________

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 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 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 98cm

Answer: 616cm

SOLUTION 1 :

Given,

r = 98cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 98

= 2 x 22 /7 x 98¹⁴

= 44 x 14

= 616 cm

Circumference of circle is 616cm.

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 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 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 11.1cm

Answer: 70.4cm

SOLUTION 1 :

Given,

r = 11.1cm

circumference of the circle = 2πr

= 2 x $\frac{22}{7}$ x 11.1

= 2 x 22 /7 x ~~11.1~~^1.6

= 44 x 1.6

= 70.4 cm

Circumference of circle is 70.4cm.

10)

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.