Why is the Area of a Circle PI Times Radius Squared?

Derivation of the Famous Formula for Area of a Circle

By Gyani, published Apr 18, 2008
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Why is the area of a circle PI*r^2?

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Takeaways
  • Anybody can figure out the formula for area of a circle, on their own!
  • The approach of going from the known to unknown helps you discover things by yourself!
  • Figure out the area of a triangle and use it to figure out the area of a circle!
Did You Know?
The value of PI goes on to infinite decimal places! The decimal values of PI do not form a repeating pattern. Some people have memorized the value of PI to
over thousand decimal places!
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Comments
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Gyani, I *LOVE* this stuff and have purchased, no lie here, 4 books solely about pi. Your article is *great*! I love the use of illustrations and the graphic computation. I did not even know you could do that! This is the kind of article that you can actually take your time and breathe to comprehend. You don't have to sift through an entire page of intimidating text just to learn what can be presented in one diagram. I enjoyed your narrative as well. More more more!! More pieces! Of PI!! ;)

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Posted on 05/03/2008 at 1:05:33 PM

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