10 terms

perpendicular line

Two line segments that intersect at right angles.

line segment

A part of a line between and including two points, called endpoints of the segment.

line

A 1-dimensional straight path that extends forever in opposite directions.

ray

A part of a line starting at the endpoint and continuing forever in one direction.

right angle

An angle that is 90 degrees.

vertex

The point at which the rays of an angle meet.

intersecting lines

Two lines that cross one another but do not for a 90 degree angle.

parallel lines

Lines in a plane that are the same distance apart and never meet.

point

A point is an exact location in space. A point is denoted by a dot. A point has no size.

plane

a plane is a flat surface that extends indefinitely in its two dimensions, length and width.