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OpenStudy (anonymous):
find the perimeter of the shaded region.
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OpenStudy (kc_kennylau):
Big semicircle - 2 * small semicircle.
OpenStudy (anonymous):
thank you :) That helps
OpenStudy (kc_kennylau):
no problem :)
OpenStudy (anonymous):
Why - in Big semicircle - 2 * small semicircle. We are talking perimeter. perimeter of Big semicircle + 2 *perimeter of small semicircle.
OpenStudy (anonymous):
\[ 10 \pi +2 (5 \pi )= 20 \pi \]
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OpenStudy (anonymous):
really?
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