If the area of a circle is 64pi square feet, find its circumference.  Choose the correct choice from the following:
A) 16 pi feet  B) 28 pi feet  C) 38 pi feet  D) 48 pi feet  E) 58 pi feet
The area is given by pi *r* r. Hence   pi * r *r = 64 pi   r * r = 64; hence r = 64 feet   The circumference is given by   2 * pi * r = 2 * pi * 8 = 16 pi feet   correct answer 16 pi feet
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If the area of a circle is 64pi square feet, find its circumference.