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A circle has an area of 324╥ cm². What is the radius?

A18 c,
B36╥ cm
C18╥ cm
D36 cm

(I think It's D) I got d=²r ...

d = (2)18 ..

BUT I'M NO SURE IF THAT

Verified Answer :

I got 18 x 18 = 324.

MissPhiladelphia

The area of a circle has the formula A = pi r^2. Since the area is known, we could determine the radius of the circle.

A = pir^2
324pi = pir^2
324 = r^2
r = square root (324)
r = 18

The answer is 18 cm.

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