Explain exterior angle
of a Triangle theorem
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The exterior angle theorem states that when a triangle's side is extended, the resultant exterior angle formed is equal to the sum of the measures of the two opposite interior angles of the triangle. The theorem can be used to find the measure of an unknown angle in a triangle.
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The exterior angle theorem states that the measure of an exterior angle is equal to the sum of the measures of the two remote interior angles of the triangle. ... The exterior angle and the adjacent interior angle are supplementary. All the exterior angles of a triangle sum up to 360º.
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