alternate angle

noun

Definition of alternate angle

: one of a pair of angles with different vertices and on opposite sides of a transversal at its intersection with two other lines:
a : one of a pair of angles inside the two intersected lines called also alternate interior angle
b : one of a pair of angles outside the two intersected lines called also alternate exterior angle

Illustration of alternate angle

illustration of alternate angle

First Known Use of alternate angle

1570


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