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OpenStudy (anonymous):
A metal washer 1 cm in diameter is pierced by a 1/2 cm hole. What is the area of one face of the washer?
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OpenStudy (sidsiddhartha):
|dw:1416485763588:dw| here r1=radius of metal washer and r2=radius of the hole
OpenStudy (sidsiddhartha):
so AREA of the washer=\[\delta A=\pi r_1^2-\pi r_2^2\]
OpenStudy (sidsiddhartha):
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