Measurement formulas - perimeter

The perimeter of a polygon (or any other closed curve, such as a circle) is the distance around the outside.

 perimeter is measured in linear units.

 Perimeter Formulas
Shape
Formula
Variables
Square
P=4s
 is the length of the side of the square.
Rectangle
P=2L+2W
 and  are the lengths of the rectangle's sides (length and width).
Triangle
a+b+c
,and  are the side lengths.
Right Triangle, with legs and  (see 
P=a+b+a2+b2
 and  are the lengths of the two legs of the triangle
Circle
P=C=2πr=πd
 is the radius and  is the diameter.

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TRIGONOMETRIC RATIOS OF COMPOUND ANGLES

Set theory symbols

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