SOLUTION: Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a radius of 20 centimeters. What is the approximate difference in the areas of their circles?

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Question 829591: Hannah drew a circle with a radius of 30 centimeters. Jonas drew a circle with a radius of 20 centimeters. What is the approximate difference in the areas of their circles?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
Area of Hannah's circle is (pi)30^2
Area of Jonas's circle is (pi)20^2
So the difference is %28pi%2930%5E2+-+%28pi%2920%5E2
%28pi%29900+-+%28pi%29400
%28pi%29500 is approximately 1570.796 cm^2