Question

Find the circumference of circle where radius is
i.
2.8 cm ii. 7 cm
​

Answer 1

Answer:

Fact: circumference of a circle whose radius is r is given by 2πr

Here r=7 cm

Hence circumference of the circle =2π(7)=2⋅

7

22

⋅7=2⋅22=44 cm

Answer 2

Answer:

• Circumference of the circle with radius 2.8 cm = 17.6 cm
• Circumference of the circle with radius 7 cm = = 44 cm

Step-by-step explanation:

i. Circumference of the circle = 2πr

= 2×3.14×2.8

= 17.6 cm

ii. Circumference of the circle = 2πr

= 2×3.14×7

= 44 cm