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Answer 1 · 2018-02-09T04:06:44

See below

The formula for circumference of a circle = $2pir$

Whre $r$ = radius of the circle

Therefore, the explanation would be to find the length of the diameter and multiply by $pi$

or,

Multiply twice the radius to $pi$

$2pir$ = $2pid/2$
(where $r = d/2$ , where d = diameter of circle)

or $2pir$ = $cancel2^1pid/cancel2^1$ = $pid$

Therefore, $2pir$ = $pid$ and both explanations are stated above for circumference