Corresponding Angles

When two lines are crossed by another line (called the Transversal):

The angles in matching corners are called Corresponding Angles.

In this example, these are corresponding angles:

a and e

b and f

c and g

d and h

Parallel Lines

If the two lines being crossed are Parallel Lines, then the Corresponding Angles are equal.

(Click on "Corresponding Angles" to have them highlighted for you.)