Geometry Terms

Front

acute angle

Back

An angle measuring less than 90°

Front

adjacent angles

Back

Two angles that share a common vertex and side

Front

angle bisector

Back

A ray that divides an angle into two congruent angles

Front

area

Back

The measure of space inside a two-dimensional figure

Front

base

Back

The surface a three-dimensional figure rests on

Front

between

Back

A point B is between points A and C if A, B, and C are collinear and AB + BC = AC

Front

bisector angle

Back

A ray that divides an angle into two equal parts

Front

circumference

Back

The distance around a circle

Front

collinear

Back

Points that lie on the same straight line

Front

complementary angles

Back

Two angles whose measures sum to 90°