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April 13th, 2015, 03:01 AM  #1 
Newbie Joined: Apr 2015 From: Hong Kong Posts: 1 Thanks: 0  Area of Circles
Can someone explain why 兀 x r x r can calculate the area of a circle? Thank you! 
April 13th, 2015, 03:39 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 3,016 Thanks: 1600 
Link to a simple, intuitive explanation ... Complete Explanation for Area of a Circle Formula  Pythagorean Math 

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area, circles 
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