19 terms

straight line

180 degrees

Complimentary angle

Angles that add up to 90 degrees

Supplementary angle

Two angles whose sum is 180 degrees

acute angle

an angle that measures less than 90 degrees

obtuse angle

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

parallel lines

lines in the same plane that never intersect

vertex

A point where two or more straight lines meet.

congruent

equal

vertical angle

A pair of opposite congruent angles formed by intersecting lines

adjacent angles

2 angles that share a common side and have the same vertex.

vertical angles

"Across" angles.

Congruent

Same size, same shape.

Adjacent angles

"Next to"

Complementary angles

Equal 90 degrees. Forms an L shape

Supplementary angles

straight line (add up to 180 degrees)

Vertical angles are ALWAYS

Congruent (the same degree measurement)

A straight line means:

The angles MUST add up to 180

When 2 lines intersect, how many angles are formed?

4

In a square, how many right angles are formed?

4