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Area of an inscribed equilateral triangle?

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Area of an inscribed equilateral triangle? [#permalink] New post 07 Apr 2010, 16:50
The area of an equilateral triangle is 9.what is the area of it's circumcircle?



I know this probably involves formulas I am not familiar with.


Detailed explanation is appreciated.
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Re: Area of an inscribed equilateral triangle? [#permalink] New post 07 Apr 2010, 20:58
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Re: Area of an inscribed equilateral triangle? [#permalink] New post 08 Apr 2010, 01:11
Hi!

You can use the area of equilateral triangle formula.....\sqrt{3}/4 * (side)^2.
Further you have the radius of a circumcircle (r) = side/\sqrt{3}.
So now you are all set for the area of the circumcircle..........

Cheers
Re: Area of an inscribed equilateral triangle?   [#permalink] 08 Apr 2010, 01:11
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