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Math Help - proving isoceles tirangle

  1. #1
    Member helloying's Avatar
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    proving isoceles tirangle

    i need help with proving the 1st part.thx
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  2. #2
    MHF Contributor
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    Quote Originally Posted by helloying View Post
    i need help with proving the 1st part.thx
    HI

    Since BC is parallel to AD , it is clear that \angle CBD=\angle BDA and

    \angle BCA=\angle CAD

    Now use the properties of circles , where angles in the same segment are equal , so

    \angle BCA=\angle BDA and \angle CBD=\angle CAD .

    and you should be able to make your deduction now .
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