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4 February, 06:38

Complete the proof of the exterior angle theorem given angle 4 is an exterior angle of triangle ABC prove angle 1 + angle 2 = angle 4

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  1. 4 February, 07:06
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    In the triangle, 1,2,3 are interior angles and 4 is the exterior angle, adjascent to 3

    angle 1 + angle 2 + angle 3 = * 180

    angle 3+angle 4=*180

    so, we can say,

    angle 1+angle 2+angle 3 = angle 3+angle 4

    i, e; angle 1+angle 2 = angle 4 proved.
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