Matching Exercise

Parallel and perpendicular lines

Two lines are parallel if they map onto each other through a 180o rotation.

    * Parallel lines never meet.
    * Parallel lines are the same distance apart.

A line that crosses a pair of parallel lines is called a transversal.

Two lines are perpendicular if they meet at right angles.

Angle Properties

Alternate angles:

    * Are between parallel lines
    * Are on opposite sides of the transversal
    * Each pair of angles is equal
    * One pair is acute
    * The other pair is obtuse

When a transversal crosses a pair of parallel lines, there are four pairs of corresponding angles.

Corresponding angles:

    * Are both above or both below the parallel lines
    * Are on the same side of the transversal
    * Each pair of angles is equal
    * Two pairs are acute
    * Two pairs are obtuse

When a transversal crosses a pair of parallel lines, there are two pairs of co-interior angles.

Co-interior angles:

    * Are between parallel lines
    * Are on the same side of the transversal
    * Each pair of angles is supplementary

Bearings are angles which are measured clockwise from north. They are always written using three digits.

A bearing gives a person a direction in which to steer.

Created by Sue Saunderson