Question

$2 \pi r$
​

Answer 1

Answer:

Pi is the ratio of circumference over diameter. 2 and r come from the formula of diameter. You have to find circumference of a circle. ... So pi times 2 times r is basically circumference over diameter times diameter which gives circumference. So that is where 2*pi*r comes from.

Please Mark Me As The Brainliest Answer.

Thanks

Answer 2

Answer:

$circumference \: of \: a \: circle \: = 2\pi \: r \: {cm}^{2}$

Hopes it helps

Pls mark as brainliest