If the area of a circle is 49pi square feet, find its circumference.
Choose the correct choice:  A) 14 pi feet  B) 43 pi feet  C) 42 pi feet  D) 18 pi feet  E) 64 pi feet
The area is given by pi * r * r. Hence   pi * r *r = 491 pi   r *r = 49 ; hence r = 7 feet   The circumference is given by   2 *pi *r = 2 * pi * 7 = 14 pi feet   correct answer 14 pi feet
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If the area of a circle is 49pi square feet, find its circumference.