16 terms

acute angle

an angle that measures less than 90 degrees

right angle

an angle that measures 90 degrees

obtuse angle

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

adjacent angles

Two angles that share a common side and have the same vertex

complementary angles

Two angles whose measures add to 90 degrees.

congruent

Figures that have the same size and shape

line

A straight path that goes without end in two directions.

measure of an angle

the number of degrees between the two rays

plane

A flat surface that extends forever

point

location in space

ray, opposite rays

a part of a line that starts at one endpoint and extends forever

segment

part of a line determine by two endpoints

sides of an angle

The two rays that form an angle.

supplementary angles

two angles that add up to 180 degrees

vertex of an angle

The common endpoint of the rays of an angle

vertical angles

two nonadjacent angles formed by two intersecting lines; Their measures are equal