When two parallel lines are cut by a transversal, the two pairs of angles on opposite sides of the transversal and outside the parallel lines, and the angles in each pair are congruent.
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It is the alternate angle to the angle of elevation
Errors......
If you mean a regular pentagon then each interior angle is 108 degrees and each exterior angle is 72 degrees
If you mean exterior angle is twice its interior angle then an equilateral triangle will fit the given description because each interior angle is 60 degrees and each exterior angle is 120 degrees
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