Key learning points

1. Problems can be solved using parallel line angle facts.
2. Problems can be solved using interior and exterior angles of polygons.
3. Problems can be solved and the solution justified using angle facts.

Common misconception

Keywords

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

• Interior angle - An interior angle is an angle formed inside a polygon by two of its edges.

• Exterior angle - An exterior angle is an angle on the outside of a polygon between an extension of an edge and the adjacent edge.