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Mathematics 10 Online
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?

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):

got it?

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