Question

State exterior angle theorem.

Answer 1

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The exterior angle theorem is Proposition 1.16 in Euclid's Elements, which states that the measure of an exterior angle of a triangle is greater than either of the measures of the remote interior angles. This is a fundamental result in absolute geometry because its proof does not depend upon the parallel postulate

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Answer 2

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The exterior angle theorem states that the exterior angle of a triangle is equal to the sum of the opposite interior angles.