SOLUTION: If the radius of a circle is increased by 2 cm, its area increases by 16PI square centimeters. What is the original radius of the circle?

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Question 657375: If the radius of a circle is increased by 2 cm, its area increases by 16PI square centimeters. What
is the original radius of the circle?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


If the original circle had a radius of , then the area of the original circle was .

The new circle then has a radius of , so the area of the new circle is .

We are given that the difference between these two areas is , so:



Solve for

John

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