Problem

General: Geometry The formula for the area of a circle is A = πr2, where r is the ra...

General: Geometry The formula for the area of a circle is A = πr2, where r is the radius of the circle and ?? is a constant.

a. Show that the derivative of the area formula is 2 ?? r, the formula for the circumference of a circle. b. Give an explanation for this in terms of rates of change.

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