Question

What is the circumference?

Answer 1

Answer: 31.4cm

Explanation:

Given : Diameter= 10cm

= 3.14

Solution : Radius= Diameter/2 = 10/2 = 5cm

Circumference = 2r = 2 x 3.14 x 5 = 3.14 x 10 = 31.4cm

Therefore, the circumference of a circle with diameter 10cm is 31.4cm

Answer 2

C = 10π cm

Explanation:

the circumference (C) of a circle is calculated as

C = 2πr ( r is the radius )

here the diameter = 10 , then r = 10 ÷ 2 = 5

C = 2π × 5 = 10π cm