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Show that thre rate of change of the are...

Show that thre rate of change of the area of a circle with respect to its radius (at any r) is equal to the circumference of the circle. Try to explain geometrically when this is true by drawing a circle whose radius is increased by an amount r. How can you approximate the resulting change in area `DeltaA` if`Deltar` is small ?

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`DeltaA ~~ 2 pi r Delta r`
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