Complementary angles
Add to 90 degree
Supplementary angles
Add to 180 degrees
Angle sum of a triangle
Add to 180 degrees
Vertically opposite angles
Equal
Equilateral triangle
Every angle = 60 degrees
Isosceles triangle
Base angles are equal
Exterior angle of a triangle
The exterior angle equals the
sum of the two interior opposite
angles
Angle sum of a quadrilateral
Add to 360 degrees