A circle has an area of 441π cm2. What is the circumference?

asked Mar 2, 2019 4.6k views

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a = πr^2
441π = πr^2
441 = r^2
21 = r

C = 2rπ
= 2(21)π
= 42π cm^2 or 131.88 cm^2

Arcenio answered Mar 3, 2019

5.5k points

2 votes

A = πr^2
r^2 = 441π/π
r^2 = 441
r = 21

C = 2πr
C = 2π(21)
C = 42π

answer
42π cm

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