If the area of a circle is 25pi square feet, find its circumference.  Choose the correct choice from the following choices.
A) 10 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 = 25 pi   r * r = 25 ; hence r = 25 feet   The circumference is given by   2 * pi * r = 2 * pi * 5 = 10 pi feet   correct answer 10 pi feet
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If the area of a circle is 25pi square feet, find its circumference.