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Math Help - Interior Angle Sum

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    Interior Angle Sum

    If l1 and l2 are lines are lines on the plane such that they are parallel transports along a transversal l, then they are parallel transports along any transversal.

    Use the above theorem to prove that the interior angle sum of a triangle is 180.
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  2. #2
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    The angles marked \alpha^{\circ} are equal because they are alternate (Z) angles.

    The angles marked \gamma^{\circ} are equal because they are alternate (Z) angles.
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