Geometry: Angle - Sum Relationships

Facts to Remember:
Complementary angles add up to 90 degrees -right <
Supplementary angles add up to 180degrees-straight
Angles of a triangle always add up to 180 degrees.
Angles of a quadrilateral always add up to 360 degrees.

Formula for polygon angle measure is 180(n - 2)
or 180 times the number of sides - 2
EX: triangle = 3 sides - 2 = 1 X 180
quadrilateral = 4 sides - 2 = 2X180 etc.
OR keep adding 180 for each side after 3