Vertical Angles
Vertical angles are pairs of opposite angles formed by intersecting lines.
In the diagram, the pairs of vertical angles are:
• Angles 3 and 5
,
• Angles 4 and 6.
Adjacent Angles
Adjacent angles are two angles that have a common side and a common vertex (corner point) but do not overlap.
From the diagram, the following are adjacent angles.
• Angles 3 and 6.
,
• Angles 4 and 5.
Supplementary Angles
These are angles that add up to 180 degrees. They are pairs of angles on a straight line. Examples of supplementary angles in the diagram are:
• Angles 1 and 2
,
• Angles 5 and 6.
