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Math Help - Having Trouble Proving These Angles Congruent

  1. #1
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    Having Trouble Proving These Angles Congruent

    I gave an image link below to use as a demenstration.

    Would angle BAC be coungruent to angle DAC since they're on a straight line (180 deg.) and angel DAC has been marked as a right triangle (90 deg.) and since 180-90=90 deg. left for angle BAC? Thus, making them congruent? Is this a valid proving process? What theorems or postulates would I use?

    http://img192.imageshack.us/img192/9476/46932074.png
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  2. #2
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    Do you have a definition of "perpendicular".

    Perpendicule lines intersect at "_____________" angles. Fill in the blank.
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  3. #3
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    I understand he term, but I am confused about how this helps me in my explanation. Sorry, I'm a bit a tired...
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