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# Area of an inscribed equilateral triangle?

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Manager
Joined: 03 Feb 2010
Posts: 68

Kudos [?]: 149 [0], given: 4

Area of an inscribed equilateral triangle? [#permalink]

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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.

Kudos [?]: 149 [0], given: 4

Manager
Joined: 29 Oct 2009
Posts: 196

Kudos [?]: 109 [0], given: 12

Concentration: General Management, Sustainability
WE: Consulting (Computer Software)
Re: Area of an inscribed equilateral triangle? [#permalink]

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07 Apr 2010, 20:58

Kudos [?]: 109 [0], given: 12

Intern
Joined: 04 Apr 2010
Posts: 9

Kudos [?]: 3 [0], given: 0

Re: Area of an inscribed equilateral triangle? [#permalink]

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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

Kudos [?]: 3 [0], given: 0

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