Vertex is where two sides of a triangle meet
Angle bisector
A line,ray, segment that splits an angle into two congruent parts
Supplementary angles
Two angles that add up to 180
Complementary angles
Two angles that add up to 90
Linear pair
Two supplementary angles that have a common side
Vertical angles
A pair of angles that are congruent and opposite made by two intersecting lines
Angel addition postulate
Two small parts add up two one big part