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Perimeter


A Perimeter is a total length around the two-dimensional shape such as a table, television, field, etc.

Example: the perimeter of the below rectangle is 9+4+9+4= 26

 

Perimeter Formulas

Perimeter of Triangle

Perimeter = a + b + c

Perimeter of Square
Perimeter = 4 × a
a = length of side

Perimeter of Rectangle
Perimeter = 2 × (a + b)

Perimeter of Circle
Circumference = 2πr
where r = radius

Perimeter of Quadrilateral
Perimeter = a + b + c + d

Perimeter of Sector
Perimeter = r(θ+2)
where r = radius
and θ = angle in radians