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Thread: Triangle angles

  1. Jun 15th, 2006, 11:21 AM #1
    Greyskull
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    Question Triangle angles

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    If triangle DEF points A, B, and C are taken on DE, DF, and EF respectively such that EC = AC and CF = BC. If angle D = 40 degrees then what does angle ACB equal (in degrees)?
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    My other question is about solving a trangle problem that requires me calculate the angle ACB in the triangle...

    ne help or suggestion will be greatly appreaciated

    thanx in advance
    Last edited by Greyskull; Dec 24th, 2007 at 08:45 AM.
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  2. Jun 15th, 2006, 01:45 PM #2
    bilm_ks
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    Re: Triangle angles

    Mark your equal angles (with x,y for example). From the big triangle you find that x+y=140 deg. Then from (ECF)=180 you can easily find that (ACB)=100 deg
    "bla, bla,... exists number M so for each n > M bla, bla..." Exists? Where is it? (Kronecker said...)
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