(a) Use the formula for the area of a circle of radius r, A = r2, to find dA/dr. (b) The
Chapter 3, Problem 57(choose chapter or problem)
(a) Use the formula for the area of a circle of radius r, A = r2, to find dA/dr. (b) The result from part (a) should look familiar. What does dA/dr represent geometrically? (c) Use the difference quotient to explain the observation you made in part (b).
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