What Does Alternate Interior Angles Mean

In the figure above click on other angle pair to visit both pairs of alternate exterior angles in turn.

What does alternate interior angles mean. D and e are alternate interior angles. Each pair of these angles are inside the parallel lines and on opposite sides of the transversal. The lines do not have to be parallel.

Notice the pairs of blue and pink angles. With each pair of alternate exterior angles both angles are outside the parallel lines and on opposite alternate sides of the transversal. A transversal is a line that intersects two or more lines.

C and f are alternate interior angles. If two parallel lines are cut by a transversal the alternate interior angles are congruent. The transversal crosses through the two lines which are coplanar at separate points.

Alternate exterior angles lie outside the lines cut by the transversal. Alternate interior angles interior angles are formed when a transversal passes through two lines. Parallel lines are two lines on a two dimensional plane that never meet or cross.

The angles that are formed on opposite sides of the transversal and inside the two lines are alternate interior angles. When a transversal intersects two parallel lines it creates both alternate interior and exterior angles. Alternate interior angles.

Alternate interior angles are a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal. In this example these are two pairs of alternate interior angles. They lie on the inner side of the parallel lines but the opposite sides of the transversal.