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Math Help - Triangle

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    Triangle

    Prove that an isosceles triangles angles are congruent.
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  2. #2
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    Quote Originally Posted by natester View Post
    Prove that an isosceles triangles angles are congruent.

    From the angle contained by the equal sides draw the bisector
    of the opposite side. The two triangles that this divides the triangle
    into two congruent trianges by SSS. Hence the base angles of the
    isosceles triangle (the ones other that the one we drew the side
    bisector from) are congruent as they are corresponding angles in
    two congruent triangles.

    RonL
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