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