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Formulas Page

Key
S = side L = length W = width
R = radius D = diameter
Radius of a circle is half of the diameter

2D Shapes

For definitions of the symbols used in these formulas, see the Symbol Definitions.

Perimeter (cirumference) Area
Square 4S S2
Rectangle 2L + 2W -or- 2(L + W) L * W
Circle πD -or- 2πR πR2 -or- π(1/2D)2