Lines, Angles, Rays, and Triangles Vocabulary

Front

An exact location in space

Back

point

Front

A straight path that goes on and on in opposite directions.

Back

line

Front

Part of a line with two endpoints

Back

line segment

Front

A part of a line that has one endpoint and continues on forever in one direction

Back

ray

Front

An angle that forms a square corner and has a measure of 90 degrees

Back

right angle

Front

An angle that is open less than a right angle and has a measure less than 90 degrees

Back

acute angle

Front

An angle that is open more than a right angle but less than a straight angle. This angle measures between 90 degrees and 180 degrees.

Back

obtuse angle

Front

An angle that forms a straight line and has a measure of 180 degrees

Back

straight angle

Front

Angles can be measured using a unit called a ___________.

Back

degree

Front

An angle that turns through 1/360 of a circle and measures 1 degree. Also called one-degree angle.

Back

unit angle