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 = 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