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OpenStudy (mony01):
The area of a circle is a function of its radius, A=πr^2 (a) Sketch two circles, one with radius r and the second with radius r + Δr, where Δr is reasonably small. (b) Express ΔA and dA symbollically. (c) Shade the area representing ΔA on your sketch. (d) Explain why dA is a good approximation to ΔA
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