If the area of a circle is \(64\pi,\) then the diameter of the circle is
(A) \(8\)
(B) \(16\)
(C) \(32\)
(D) \(8\pi\)
(E) \(16\pi\)
Answer: B
Source: GMAT Paper Tests
If the area of a circle is \(64\pi,\) then the diameter of the circle is
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Solution:
Letting r be the radius of the circle, we have:
πr^2 = 64π
r^2 = 64
r = 8
Since the radius of the circle is 8, the diameter of the circle is 16.
Answer: B
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