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OpenStudy (darkworld131):
what is the area of a circle who's diameter is 10cm
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OpenStudy (anonymous):
area = pi*r^2. radius = diameter/2 so area will be a = pi* (10/2)^2
OpenStudy (anonymous):
A of circle = pir2 = (pi)(5cm) = 5pi The radius will be half the diameter which is 5cm.
OpenStudy (rulnick):
Be careful. The answer is pi r^2 = pi (5 cm)^2 = pi 25 cm^2, or 25 pi centimeters squared.
OpenStudy (darkworld131):
@rulnick thank you
OpenStudy (anonymous):
oh yes, its pi times r to the power of 2. good luck.
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OpenStudy (rulnick):
Welcome.
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