If two lines intersect, then the two angles on opposite sides of the vertex are called vertical angles.
Two angles are called supplementary if they add up to 180 degrees.
A transversal is a line that crosses a pair of given lines.
Same-side Interior Angles
A pair of angles like 4 and 6.
Alternate Interior Angles
A pair of angles like 3 and 6.
Same-side Exterior Angles
A pair of angles like 2 and 8.
Alternate Exterior Angles
A pair of angles like 2 and 7.
A pair of angles like 1 and 5.
An angle is a measure of an amount of turning. It is often represented by two rays meeting at a common vertex.
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