Congruent
Two or more angles of the same measure
Angle bisector
A ray that divides an angle into two equal parts
Perpendicular bisector
A line, segment, or ray perpendicular to a segment at it’s midpoint (+)
Vertical angles
Two angles across from each other on intersecting lines, they are always congruent
Adjacent angles
Two angles that are next to each other and share a common side
Linear pair
Two angles that are adjacent and supplementary, they always form a straight line (180°)
Complementary angles
Two angles that equal 90°
Supplementary angles
Any two angles that equal 180°