An undefined term, which has an infinite length and an infinite number of points

An undefined term, flat 2D surface extending infinitely in all directions, must contain at least 3 points

2 rays (sides) that share 1 common endpoint called the vertex

a part of a line with only 1 endpoint

a part of a line with 2 endpoints and has length

points that are together on the same line

Anything that is together on the same plane

A point exactly in the middle of a segment, divides into two congruent segments

Two angles with a common vertex AND a common side "next to"

A ray that divides an angle into two congruent adjacent angles

An angle that measures between 0 and 90 degrees

An angle that measures between 90 and 180 degrees

An angle that measures exactly 90 degrees

An angle that measures exactly 180 degrees