<PRE><B>Question 214402</B>
 need to find the total surface area of a metal washer that is 2.53 cm in diameter, 0.08cm high and the hole that is drilled out in the center measured 0.32cm in diameter
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Top = [(pi)(2.53/2)^2 - pi(0.32/2)^2 ] cm^2
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The bottom area is the same as the top so double the top area.
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Outer side Area?
sa = (circumference)*(height)
sa = 2(pi)2.53 * 0.08
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Inner side Area?
= 2(pi)0.32*0.08 
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Add top + bottom + outside + inside to get Total surface area
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Cheers,
Stan H.
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