Perimeter is said to be the length of the boundary or the
outline of a 2 dimensional shape. The perimeter of a circle and ellipse is
called **circumference**.

## Formulas for Different 2D Shapes

### Rectangle

The parameter of the rectangle is twice the times of sum of length and width of rectangle.

*P= 2(L + W)*

### Square

Parameter of the square is 4 times the length of a side.

*P= 4a*

### Triangle

The perimeter of a triangle is the sum of the lengths of all the edges of the triangle.

*P = a + b +c*

### Circle

Total length of the boundary of the circle is known circumference of the circle.

*C = 2Ď€r*

Where, ** r** is the radius of the circle.

### Quadrilateral

The parameter of any quadrilateral is given by:

*P = a + b + c + d*

x