Geometrical Terms

Front

a position or dot labelled by a capital letter where two lines cross each other

Back

point

Front

a flat surface with no edges or boundaries

Back

plane

Front

a straight (one-dimensional) figure that extends to infinity in both directions

Back

line

Front

part of a line but has two endpoints

Back

line segment

Front

part of a line that has one endpoint and extends forever in one direction

Back

ray

Front

when two lines meet at a point, they form an angle

Back

angle

Front

the endpoint where the two rays of an angle meet, also known as a point

Back

vertex

Front

divide (a line, angle, or shape) into two exactly equal parts

Back

bisect

Front

the unit of measurement of an angle

Back

degree

Front

an angle that has a measurement less than 90 degrees

Back

acute angle