To find the perimeter of a rectangle, add the lengths of the rectangle's four sides. If you have only the width and the height, then you can easily find all four sides (two sides are each equal to the height and the other two sides are equal to the width). Multiply both the height and width by two and add the results.

How do we measure and calculate perimeter?

Calculating perimeter

The perimeter is the distance all the way around the outside of a 2D shape. To work out the perimeter, add up the lengths of all the sides.

How do you calculate the perimeter of a room?

Add together the lengths of all the walls to calculate the perimeter of any room. For example, suppose a room has two curved walls that measure 18 and 20 feet, and three straight walls that measure 18, 24, and 15 feet. Adding those numbers together results in a perimeter of 95 feet.