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OpenStudy (anonymous):
a circle has an area of 153.86 square meters. What is the radius. ( a = pi r squared) and what is the circumference ( 2 pi r)
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OpenStudy (anonymous):
You're given the equations, just work backwards.
Directrix (directrix):
Area of a Circle = pi r^2 153.86 = pi r^2 49 = r^2 7 = r meters --- Circumference = 2 pi r C = 2 (3.14) (7) C = 43.96 meters
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