# diffirential calculus

considering the area of a circular ring as a increment of area of a circle, find approximately the area of a ring whose inner and outer radii are 3 inches and 3.02 inches, respectively.

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1. Formula to find area of circle=(3.14*r2)/2 as r is inches . Their units will also be in inches.

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2. Area = dc/dt =2(pi)r(dr/dt)
= 2(pi)(3)(0.02)
= 0.377 in2

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