ASVAB - Math Formulas and Terms with 100% correct definitions

Circumference for a circle C = pi(diameter) Radius of a circle R = 2pi(radius) Area of a circle A = pi(radius)^2 Volume for rectangular objects V= (length)(width)(height) Volume for cylinders V= pi(radius)^2(height) Area of a triangle A = 1/2(base)(height) Perimeter of a quadrilateral P = 2(length) + 2(width) Area of a quadrilateral A = (length)(width) Square footage SF = (length)(width) How to add and subtract fractions Find a common denominator, then add or subtract numerators, then simplify if needed How to multiply fractions Multiply numerators, then denominators How to find a percentage increase Subtract old cost from new cost, then divide the difference by the old cost How to find a savings from a percentage Multiply the price by the amount of discount Radius Always half the diameter Triangles 3 sides always equal 180 degrees Isosceles Triangle 2 equal sides Equilateral Triangle 3 equal sides - each 60 degrees Right Triangle 1 right angle 90 degrees, 2 complementary angles adding up to 90 degrees Formula to find the sum of a finite arithmetic sequence S = n/2 (a + b) Formula to find geometric mean M = square root of (a)(b) Quadrilaterals Shapes with 4 sides always equal 360 degrees. EX: square, rhombus, rectangle, parallelogram, trapezoid Diameter of a circle D = 2(radius)