Complementary Angles: 2 angles that add up to 90 degrees
Supplementary Angles: 2 angles that add up to 180 degrees
Vertical Angle: angles that are opposite of each other when two lines cross
Adjacent Angles: two angles that have a common side and a common vertex point but do not overlap in any way
Acute Triangle: Triangle that has angle less than 90 degrees
Obtuse Triangle: Triangle that has an angle greater than 90 degrees
Right Triangle: Triangle that has an angle of 90 degrees
Scalene Triangle: No Congruent Sides
Equilateral Triangle: 3 congruent sides
Isosceles Triangle: 2 congruent sides