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How Area Changes with Diameter
It is easy to believe that when you change one dimension of a figure, its area changes by the same percentage. However, this is incorrect.
The area of a circle changes with the square of its diameter. For example, doubling the diameter quadruples the area. Another example: tripling the diameter makes the area go up by a factor of nine.




"How Area Changes with Diameter" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/HowAreaChangesWithDiameter/
Contributed by: Sarah Lichtblau
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