If the area of a circle is 16pi square feet, find its circumference.	Choose the correct choice from the following answers:
A) 8 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 = 16 pi   r * r = 16; hence r = 16 feet   The circumference is given by   2 * pi * r = 2 * pi * 4 = 8 pi feet   correct answer 8 pi feet
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If the area of a circle is 16pi square feet, find its circumference.