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Math Help - Need Help ASAP

  1. #1
    Junior Member whytechocolate01's Avatar
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    Exclamation Need Help ASAP

    Given: In triangle ABC, angle B = 120

    Prove: Angle A not equal to 60 degrees

    Plan: Use an indirect proof...


    Please explain!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by whytechocolate01 View Post
    Given: In triangle ABC, angle B = 120

    Prove: Angle A not equal to 60 degrees

    Plan: Use an indirect proof...


    Please explain!
    in a triangle, all the angles add up to 180 degrees. so if angle B = 120, then angle A + angle C = 180 - 120 = 60.

    so if angle A is 60, it would mean angle C is 0, and so we would not have a triangle. thus angle A must be less than 60 which means angle A is not equal to 60 degrees


    you can fix this up this proof if you want
    Last edited by Jhevon; May 2nd 2007 at 12:55 PM. Reason: punctuation, grammar...yes, i know i didn't capitalize anything, i'm not obsessive-compulsive
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