GEOMETRY-FORMULAS AREA OF POLYGONS 1. Area of a parallelogram = base times height 2. Area of a rectangle = base times height 3. Area of a trapezoid = 1/2 times height times (base1 +base2) 4. Area of a square = side squared 5. Area of a triangle = 1/2 times base times height 6. Area of a right triangle = 1/2 times leg1 times leg2 7. Area of an equilateral triangle = 1/4 times side squared times the square root of 3 CIRCLES 1. Area of a circle = 3.14 times radius squared 2. Circumference of a circle = 3.14 times the diameter of the circle VOLUME 1. Volume of a cube = side times side times side 2. Volume of a rectangular solid = length times width times height