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#exterior_angle_theorem

Exterior angle theorem

Exterior angle of a triangle is greater than either of the remote interior angles

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.

Wed 16th

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Exterior angle theorem Angle bisector theorem Sum of angles of a triangle Inscribed angle Transversal (geometry) Triangle Angle Cyclic quadrilateral Stokes' theorem Generalized Stokes theorem
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