Basic Geometry Terms

Front

Point

Back

A location in space with no dimensions, represented by a dot.

Tags

CCSS.4.G.A.1

Front

Ray

Back

A part of a line that starts at a point and extends infinitely in one direction.

Tags

CCSS.4.G.A.1

Front

Line

Back

A straight one-dimensional figure extending infinitely in both directions.

Tags

CCSS.4.G.A.1

Front

Line Segment

Back

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

Tags

CCSS.HSG.CO.A.1

Front

Vertex

Back

A point where two or more lines or edges meet, forming an angle.

Front

Acute angle

Back

An angle that is less than 90 degrees.

Tags

CCSS.4.G.A.1

Front

Obtuse angle

Back

An angle that is greater than 90 degrees.

Tags

CCSS.4.G.A.1

Front

Right angle

Back

An angle that is exactly 90 degrees.

Tags

CCSS.4.G.A.1

Front

Complementary angle

Back

Two angles whose measures add up to 90 degrees.

Tags

CCSS.7.G.B.5

Front

Supplementary angle

Back

Two angles whose measures add up to 180 degrees.

Tags

CCSS.7.G.B.5