Asked by Thomas

The area of circle c is 81 pi . if the radius of the circle is doubled, what is the circumference of the new circle ?

please answer and explain
Answered by Ms. Sue
162 pi
Answered by Thomas
my answer is 162 pi too, but the answer is

a. 18 pi
b. 36 pi
c. 36 pi^2
d. 324 pi
e. 324 pi^2
Answered by Steve
if a = 81pi, r = 9
if r = 18, c = 36pi
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