Definition:Transversal (Geometry)/Alternate Angles

Definition

 * Transversal.png

Alternate angles are interior angles of a transversal, which are on opposite sides and different lines.

In the above figure, the pairs of alternate angles with respect to the transversal $EF$ are:
 * $\angle AHJ$ and $\angle DJH$
 * $\angle CJH$ and $\angle BHJ$

Also known as
It may be possible to see the alternate angles if a transversal referred to as the alternate interior angles, but the majority of sources take it for granted that the angles in question are interior.

Also see

 * Equal Alternate Angles implies Parallel Lines
 * Parallelism implies Equal Alternate Angles


 * Definition:Interior Angle of Transversal
 * Definition:Exterior Angle of Transversal
 * Definition:Corresponding Angles of Transversal