Geometry Basics

Front

Point

Back

An exact location in space, typically represented by a dot.

Front

Line

Back

A straight one-dimensional figure having no thickness and extending infinitely in both directions.

Front

Plane

Back

A flat, two-dimensional surface that extends infinitely far.

Front

Line Segment

Back

A part of a line that is bounded by two distinct end points.

Front

Angle

Back

A figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.

Front

Acute Angle

Back

An angle that is less than 90 degrees.

Front

Right Angle

Back

An angle that is exactly 90 degrees.

Front

Obtuse Angle

Back

An angle that is more than 90 degrees but less than 180 degrees.

Front

Complementary Angles

Back

Two angles whose measures add up to 90 degrees.

Front

Supplementary Angles

Back

Two angles whose measures add up to 180 degrees.