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What is the radius of the inscribed circle to a triangle

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What is the radius of the inscribed circle to a triangle [#permalink] New post 10 Aug 2003, 14:49
What is the radius of the inscribed circle to a triangle whose sides measure
21cm, 72cm and 75cm respectively?
(1) 9 cm
(2) 37.5 cm
(3) 28.5 cm
(4) 14.5 cm

Can anyone help in solving this problem?

Thanks
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Re: Geometry [#permalink] New post 10 Aug 2003, 17:34
Rajven wrote:
What is the radius of the inscribed circle to a triangle whose sides measure
21cm, 72cm and 75cm respectively?
(1) 9 cm
(2) 37.5 cm
(3) 28.5 cm
(4) 14.5 cm

Can anyone help in solving this problem?

Thanks


Perhaps if you checked to see if such triangle followed pythagorean's law, you might find it a bit easier.

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MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993

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 [#permalink] New post 16 Jul 2004, 09:39
Any answers for this one ?
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 [#permalink] New post 16 Jul 2004, 09:59
A..........9!! Take the cue from Akamaibrah.......Its a right triangle!!

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 [#permalink] New post 16 Jul 2004, 10:21
Can exaplin the answer

how AF = 75-r
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 [#permalink] New post 16 Jul 2004, 10:24
nice diagram ;)

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 [#permalink] New post 16 Jul 2004, 10:24
cbrf3 wrote:
A..........9!! Take the cue from Akamaibrah.......Its a right triangle!!


This is exactly right.

Lines of tangency that come together around a circle are equal.
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 [#permalink] New post 16 Jul 2004, 10:26
K_s_r wrote:
Can exaplin the answer

how AF = 75-r


we have 2 sets of congruent triangles. that is how the sides are equal.

AF is 72-r

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  [#permalink] 16 Jul 2004, 10:26
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