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# 6.4: Measures of Angle Pairs

Difficulty Level: At Grade Created by: CK-12
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Practice Angle Pairs

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### Vocabulary Language: English

Two angles are adjacent if they share a side and vertex. The word 'adjacent' means 'beside' or 'next-to'.

Angle

A geometric figure formed by two rays that connect at a single point or vertex.

Intersecting lines

Intersecting lines are lines that cross or meet at some point.

Parallel

Two or more lines are parallel when they lie in the same plane and never intersect. These lines will always have the same slope.

Perpendicular lines

Perpendicular lines are lines that intersect at a $90^{\circ}$ angle.

Straight angle

A straight angle is a straight line equal to $180^{\circ}$.

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