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Complementary Angles

The sum of the measure of two angles is 90 degrees.

Supplementary Angles

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

Adjacent Angles

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

Vertical Angles

Angles opposite one another when two lines intersect.

transversal

A line that intersects two or more lines.

Parrallel Lines

Lines in the same plane that never intersect, equal distance apart

corresponding angles

Angles that have the same relative positions in geometric figures.

Exterior Angles

outside angles adjacent to the interior angles when the sides of a triangle are extended

interior angles

inside angles when sides of triangle are extended

alternate exterior angles

lines on different sides of the transversal, but on the outside of the lines cut by the transversal

alternate interior angles

Angles that lie within a pair of parallel lines and on opposite sides of a transversal; congruent

consecutive interior angles

..., If two parallel lines are cut by a transversal, then each pair of consecutive interior angles is supplementary

right angle

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

Acute Angle

An angle that measures LESS than 90 degrees.

Obtuse Angle

An angle that measures MORE than 90 degrees