Matching Pairs Geometry Formulas (D)Online version 7th grade geometry by STEPHANIE GREGORY 1 Circumference of a semi-circle 2 Area of a Circle 3 Area of a rectangle or square 4 SSS 5 AAA 6 Complementary Angles 7 Circumference of a Circle 8 Vertical Angles 9 Volume of a rectangular prism 10 Volume of a triangular prism 11 Area of a semi-circle 12 Area of a triangle 13 Supplementary Angles 2 or more angles that equal 180 degrees because together they form a straight line. 1/2 x pi x radius squared length x width Pi x diameter 1/2 x pi x diameter length x width x height a + b > c Angles that are on opposite sides of the figure. They are equivalent. 1/2 x base x height x height 2 or more angles that have a sum of 90 degrees because together they form a right angle all angles together = 180 degrees Pi x radius squared 1/2 x base x height