Geometry Vocab

Front

A straight path extending infinitely in both directions, containing countless points.

Back

Line

Front

Angle < 90°

Back

Acute Angle

Front

Middle point of a line segment

Back

Midpoint

Front

Lines that do not intersect

Back

Parallel

Front

Two angles that sum to 90°

Back

Complementary Angles

Front

Part of a line with two endpoints and all points in between

Back

Line Segment

Front

Part of a line with one endpoint and all points on one side.

Back

Ray

Front

Angles sharing a common side and vertex

Back

Adjacent Angles

Front

Angles opposite each other when two lines cross

Back

Vertical Angles

Front

Lines that intersect to form four 90° angles

Back

Perpendicular Angles