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How are the interior and exterior angles of a triangle related ?

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The interior and exterior triangles are related because they are in the pyramid x + c = Triangle so thats how
User Turtlepower
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Sample Response: The exterior angle, D, is supplementary to the adjacent interior angle, C. Together, they form a straight line, measuring 180°. The measure of the remote interior angles, A and B are equal to the measure of the exterior angle D.

User Morten Zilmer
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