Question

Find the circumference of the circle with the given radius or diameter. (Use 3.14 for it) r=20

Answer 1

`\huge\boxed{C\approx125.6}`

Explanation:

The formula of a circumference of a circle:

`C=d\pi=2\pi r`

d - diameter

r - radius

We have the radius r = 20.

Substitute:

`C=2\pi(20)=40\pi`

use π ≈ 3.14

`C\approx(40)(3.14)=125.6`

Answer 2

C = 2πr = 2 * 3.14 * 20 = 125.6