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right angle

An angle that is 90 degrees (It makes a square in the corner).

Obtuse Angle

An angle that measures MORE than 90 degrees

straight angle

An angle that measures 180 degrees

Complimentary Angles

Angles whose measure adds up to 90 degrees.

Supplementary Angles

The sum of the measure of two angles is 180 degrees.

Vertical Angles

Angles opposite one another when two lines intersect.

Adjacent Angles

Angles that are next to each other. They share a vertex and a common side.

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

Congruent Angles

Angles with equal measures are..

reflex angle

Angles whose measure is >180 degrees and <360 degrees

Acute Angle

An angle that measures LESS than 90 degrees.

ray

Part of a line that has one end point and goes in one direction without end.

Line

A straight path that goes without end in two directions.

line segment

Part of a line with two end points.

Perpendicular lines

lines in a plane that intersect to form 4 right angles

parallel lines

2 lines that never cross/intersect and stay the same distance apart

Intersecting lines

Two or more lines that meet at a common point.