Line

connects two points and extends forever in both directions

Line Segment

Portion of the line and has two endpoints

Ray

It has an endpoint and extends forever in one direction.

Parallel Lines

Two lines in the same plane which will never intersect

Perpendicular Lines

Two lines that meet at a right angle.

Intersecting

lines, rays, line segments or figures meet, or share a common point or points.

Angle

Two rays that share the same endpoint

Vertex

The point where the rays intersect

Acute Angle

angle measuring between 0 and 90 degrees.

Right Angle

angle measuring 90 degrees or two perpendicular rays

Obtuse Angle

Angle measuring greater than 90° but less than 180°.

Complimentary Angles

Angles that adds up to 90 degrees

Supplementary Angles

Angles that adds up to 180 degrees

Vertical Angle

Angles opposite one another at the intersection of two lines.

Reflex Angle

Angles whose measure is >180 degrees and <360 degrees.

Transversal lines

a line that passes through two lines in the same plane at two distinct points.