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# What is the radius of a circle inscribed in a triangle whose

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What is the radius of a circle inscribed in a triangle whose [#permalink]  01 Mar 2004, 12:54
What is the radius of a circle inscribed in a triangle whose sides measure 21cm, 72cm and 75cm?

9cm
37.5cm
28.5cm
14cm

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Pls include reasoning along with all answer posts.
****GMAT Loco****
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Senior Manager
Joined: 30 Aug 2003
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Since this is a right triangle the area is 21x72/2=756. The area of a triangle that has a circle inscribed is S=pr ( p-half the perimeter of triangle, r-radius of inscribed circle).P=168,(21+75+72) ,p=P/2=84 Then 756/84= r =9
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