4.G. 1 Basic Geometry Terms

Front

Point

Back

An exact location in space.

Front

Ray

Back

Part of a line with only ONE endpoint.

Front

Line Segment

Back

Part of a line with TWO endpoints.

Front

Line

Back

A straight path that has no endpoints, and extends in both directions forever.

Front

Perpendicular Lines

Back

Lines that intersect at right angles.

Front

Parallel Lines

Back

Lines that will never intersect.

Front

Angle

Back

The space created between two intersecting lines, measured in degrees.

Front

Right Angle

Back

An angle that measures exactly 90 degrees.

Front

Acute Angle

Back

An angle that is smaller or less than 90 degrees.

Front

Obtuse Angle

Back

An angle that is larger than 90 degrees, and less than 180 degrees.