I noticed this yesterday while I was driving:
A=pi(d/2)^2
pi=C/d
plugging the above in for pi:
A=Cd/4
which I find interesting (even if you don't :P ). It means, at least in my head, that the area of a circle is equal to 1/4th of the area of the rectangle made by it's diameter and circumference. I am not sure how this is useful, and I'm sure some one else has come up with this before--probably some one a long time ago (but I couldn't figure out how to search for this on google; that is something google needs: a way to search for a formula), but it is cool nonetheless.
A=pi(d/2)^2
pi=C/d
plugging the above in for pi:
A=Cd/4
which I find interesting (even if you don't :P ). It means, at least in my head, that the area of a circle is equal to 1/4th of the area of the rectangle made by it's diameter and circumference. I am not sure how this is useful, and I'm sure some one else has come up with this before--probably some one a long time ago (but I couldn't figure out how to search for this on google; that is something google needs: a way to search for a formula), but it is cool nonetheless.
posted by Amanda at 11:26 AM
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