Complementary/Supplementary Angles, Adjacent, & Vertical Angles

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straight line

180 degrees

adjacent angles (definition)

2 angles that share a common side, common vertex, and do not overlap

When 2 lines intersect, how many angles are formed?

4

vertical angles

A pair of opposite congruent angles formed by intersecting lines

vertex

A point where two or more straight lines meet.

obtuse angle

An angle that measures more than 90 degrees but less than 180 degrees

Vertical angles are ALWAYS

Congruent (the same degree measurement)

A straight line means:

The angles MUST add up to 180

acute angle

an angle that measures less than 90 degrees

congruent

equal

parallel lines

lines in the same plane that never intersect

Adjacent angles

right "next to"

Supplementary angles

two angles whose sum is 180 degrees

Complementary angles

two angles whose sum is 90 degrees


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