Key learning points

1. Corresponding angles are equal if they are on parallel lines and the same side of the transversal.
2. Alternate angles are equal if they are on parallel lines and the opposite sides of the transversal.
3. Supplementary co-interior angles sum to 180°

Common misconception

Keywords

• Transversal - A transversal is a line, line segment, or ray that intersects through two or more lines at distinct (different) points.

• Corresponding angles - Corresponding angles are a pair of angles at different vertices on the same side of a transversal in equivalent positions.

• 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.

• Co-interior angles - Co-interior angles are on the same side of the transversal line and in between the two other lines.