Tutorial on angles formed when a transversal L3 intersects two parallel lines L1 and L2. You may also want to solve problems related to Parallel Lines and Angles.

## Corresponding AnglesAll corresponding angles are congruent and are equal in measure. The pairs of anglesa and a ' , b and b ' , c and c ' and d and d ' are corresponding angles.(see figure below).
measure of angle a = measure of angle a ' measure of angle b = measure of angle b ' measure of angle c = measure of angle c ' measure of angle d = measure of angle d '
## Alternate Interior AnglesThe pairs of alternate interior angles in the figure below are d and d ' and c and c '. The alternate interior angles are congruent and equal in measure. (see figure below)measure of angle d = measure of angle d ' measure of angle c = measure of angle c '
## Alternate Exterior AnglesThe pairs of alternate exterior angles in the figure below are a and a ' and b and b '. The alternate exterior angles are congruent and equal in measure. See figure below)measure of angle a = measure of angle a ' measure of angle b = measure of angle b ' ## More References and Links to GeometryGeometry Tutorials, Problems and Interactive Applets. |