Acute
Measures below 90º
Right
Equal to 90º
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Acute
Measures below 90º
Right
Equal to 90º
Obtuse
Larger than 90 but less than 180º
Straight
Equal to 180º
Complementary Angles
Angles that add up to 90º
Supplementary Angles
Angles that add up to 180º
Vertical Angles
Angles that are equal
Adjacent Angles
Angles with a common side and vertex
Ray
Contains one endpoint and extends forever in one direction
Segment
A portion of a line that has two endpoints
Perpendicular Lines
Two lines which intersect at right angles
Transversal Line
Line that crosses two or more lines
Alternate Interior Angles
Two angles on different sides formed inside two parallel lines
Alternate Exterior Angles
Two angles on different sides formed outside parallel lines
Corresponding Angles
Angles on the same side, one interior and one exterior, but not adjacent.