Chapter 12 Formulas

Base Area Formulas "B"

Rectangle or square = base * height

Square = 1/2 * diagonal #1 *diagonal #2

Triangle = base * height / 2

Trapezoid = 1/2 * height * (base1 + base2)

Circle = pi * radius^2

 Pentagon, Hexagon, Octagon, Decagon Equilateral Triangle= Perimeter * apothem / 2
 (Follow the a, b, s, P, A sequence to find the area of these regular polygons!!)

Perimeter and Circumference Formulas

Polygon = (add all sides)

Circle = 2 * r * pi

Prisms and Cylinders

Surface Area = (2*Base Area) + (Perimeter * height)

Volume = Base Area * height

Pyramids and Cones

Surface Area = Base Area + 1/2 *  Perimeter *slant height

Volume = Base Area * height / 3

Spheres

Surface Area = 4 * pi * radius^2

Volume = 4/3 * pi * radius^3

 

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