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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]

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01 Mar 2004, 12:54
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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01 Mar 2004, 17:29
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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shubhangi

01 Mar 2004, 17:29
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