title pretty much "sums" it all up. im so punny.
A. = area
V. = Volume
S.A. = Surface Area
L.S.A. = Lateral Surface Area
² = squared...duh
r = radius

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A. of a Rectangle

Length • Width

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Circumference

π • diameter

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A. of Triangle

1/2 base • height

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A. of Equilateral Triangle

side² • √3 ÷ 4

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A. of Rhombus

1/2 diagonal1 • diagonal2

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V. of Rectangular Prism

Length • Width • Height

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S.A. of Rectangular Prism

2LW • 2LH • 2WH

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Volume of any prism

(Area of the Base) • Height

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S.A. of a prism

2(Area of the Base) + (Area of all rectangular lateral faces)

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V. of a cylinder

π • r² • height

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S.A. of a cylinder

2π • r² + 2π • r • height

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L.S.A. of a cylinder

2π • r • height

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V. of a cone

1/3π • r² • height

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S.A. of a cone

π • r² + π • r • Slant Height

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L.S.A. of a cone

π • r • Slant Height