Building Blocks of Geometry Terms

Front

Collinear points

Back

Points that lie on the same line.

Front

Midpoint

Back

The point of a line segment that is the same distance from both endpoints.

Front

Congruent

Back

Same size and shape.

Front

Bisects

Back

To divide into 2 congruent (equal) parts.

Front

Line segment

Back

Two points and all the points between them that are collinear with the 2 points.

Front

Ray

Back

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

Front

Plane

Back

A flat, two-dimensional surface that extends infinitely in all directions.

Front

Angle

Back

Formed by two rays with a common endpoint, called the vertex.

Front

Acute angle

Back

An angle that measures less than 90 degrees.

Front

Obtuse angle

Back

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