Basic Geometry Terms

Front

A ray or segment that divides something into two parts that are congruent

Back

Bisector

Front

Two angles whose measures have the sum 90°

Back

Complementary angles

Front

Points that lie on the same line

Back

Collinear points

Front

Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction

Back

Ray

Front

The longest side of a right triangle, opposite the right angle

Back

Hypotenuse

Front

A flat surface that extends infinitely in all directions

Back

Plane

Front

A part of a line that has two endpoints

Back

Line segment

Front

An angle that measures exactly 90°

Back

Right angle

Front

Two angles whose measures have the sum 180°

Back

Supplementary angles

Front

A point where two lines intersect

Back

Vertex