Key learning points

1. Alternate angles can be identified in an arrangement of 3 line segments.
2. If two of the lines are parallel these alternate angles are equal.
3. Knowledge of alternate angles can be used to find unknown angles.
4. Knowledge of corresponding and alternate angles can be used to find unknown angles.

Common misconception

Keywords

• Alternate angles - A pair of angles both between or both outside two line segments that are on opposite sides of the transversal that cuts them.