# Example 2

- Author:
- Walch Education

- Topic:
- Angles, Parallelogram

Use the parallelogram from Example 1 to verify that the opposite angles in a parallelogram are congruent and consecutive angles are supplementary given that and .

- Extend the lines in the parallelogram to show two pairs of intersecting lines and label the angles with numbers.
- Prove
. - Prove
. - Prove that consecutive angles of a parallelogram are supplementary.