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

alternate interior angles a, a′, b, b′; alternate exterior angles c, c′, d, d′

First Known Use of alternate angle

1570, in the meaning defined above

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The first known use of alternate angle was in 1570

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