Geometry Vocabulary

Front

Parallel lines

Back

Two lines that never intersect

Front

Perpendicular lines

Back

Two lines that form right angles

Front

Complementary angles

Back

Two angles whose sum is 90 degrees

Front

Supplementary angles

Back

Two angles whose sum is 180 degrees

Front

Linear Pair

Back

Two adjacent angles that form a straight line (angle)

Front

Adjacent Angles

Back

Angles that are immediately next to each other

Front

Vertical Angles

Back

Two angles that are formed by the intersection of two straight lines and are across from each other. These angles are congruent (equal) and form the 'bow tie' shape.

Front

Alternate Interior Angles

Back

Angles located on opposite sides of the transversal, and inside the parallel lines. They are congruent. Form a 'Z' shape.

Front

Vertex

Back

The common endpoint of an angle, where two or more lines meet. Also, the name for a corner of a polygon.

Front

Corresponding angles

Back

Angles that are in the same position on different lines; an exact match/copy. They are congruent. Forms an 'F' shape.