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