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OpenStudy (anonymous):
Find the formula, in terms of K, for the area of a regular octagon with apothem K and side of 10.
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OpenStudy (anonymous):
A = 1/2*P*a (P is perimeter, a is apothem) A = 1/2(8*10)*K A = 1/2(80)*K A = 40*K A/40 = K
OpenStudy (anonymous):
so its gonna be 40
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