Question

The area of a circle is 64pi.What is the diameter of the circle?

a. 32

b. 16

c. 8

d. None of the above

Answer 1

option B is the correct answer

Answer 2

$\pi \: r {}^{2} = 64 \pi\\ r {}^{2} = 64 \\ r = 8 \\ diaeter = r + r \\ = 8 + 8 = 16$