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OpenStudy (anonymous):
In the figure below, the shaded region of the circle with center C has an area of 25π. What is the circumference of the circle with center C? 5π 10π 20π 25π 100π
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OpenStudy (anonymous):
OpenStudy (cwrw238):
area of whole circle = 4 * 25pi = 100pi area = pi r^2 = 100 pi so r = 10 circumference = 2 pi r = 20 pi
OpenStudy (anonymous):
so the answer is 20π?
OpenStudy (cwrw238):
yup
OpenStudy (anonymous):
thnx!
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OpenStudy (cwrw238):
yw
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