Respuesta :

Circumference Formula: 2pi x r

Radius = 20.5

Plug it in:

2(3.14) x 20.5

6.28 x 20.5 = 128.74

Then, convert to pi terms.

128.74 = 41 pi

Therefore the circumference of a circle with a radius of 20.5m is 41pi.

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