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Area Of A Circular Ring

Check us out at http://www.tutorvista.com//videos A circular ring (annulus) is plane figure bounded by the circumference of two concentric circles of two different radii. The area of a circular ring is found by subtraction the area of small circle from that of the large circle. The examples of annulus are the area of a washer and the area of a concrete pipe. If A and a, R and r stands for the areas and the radii of two circles andAr for the area of the ring, then Ar = a-a = Pie R square Pie r square = Pie(R square- r square) = Pie(R r)(R+R)
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