Area of an annulus

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Annulus area
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How do you pronounce this??? Area of a what?

NikhilAutar
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Too complicated. Try my much simpler method. Using your example of outside dia. [o/d] of 25 cm. and an inside dia. [i/d] of 11 cm. this gives the width [w] of the annulus as 1.5 cm.
Formula = o/d - w X pi X w = Ans. 25 minus 1.5 X pi X 1.5 = 110.74 cm. Ans.

briansolloway