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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
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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AkamaiBrah
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
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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