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Alternate angle

The word 'alternate' is usually used with pairs of angles, to indicate that each is on opposite sides of a line. In the figure below, the two angles are called alternate angles because they are on opposite sides of the sloping transversal line.

Pages referring to 'alternate-angle'

Definition and properties of alternate exterior angles, showing the pairs of angles associated with a transversal
Definition and properties of alternate interior angles, showing the pairs of angles associated with a transversal