A rectangle has four sides and its opposite sides are equal. One pair of opposite sides is called the length and the other pair is the width. To find the perimeter of a rectangle multiply the length by two, multiply the width by two, and then add the products.
FORMULA FOR THE PERIMETER OF A RECTANGLE
Let`s call P the perimeter of a rectangle having length L and with W. To find the perimeter of a rectangle add the length and the width and multiply the sum by two.
P = 2(L + W)
Before ordering baseboard trim, the perimeter of a 12 ft x 18 ft room must be found. What is the perimeter of the room?
- Add the length and width in the brackets. The length plus the width represent halfway around the room:
12 +18 = 30
- Multiply the sum of the length and width by 2 to find the entire distance around.
2 x 30 = 60
The perimeter of the room is 60 ft.