What is the formula to calculate the perimeter of a rectangle?

The formula for calculating the perimeter of a rectangle is indeed expressed as the sum of all its sides. In the case of a rectangle, which has two lengths (l) and two widths (w), the perimeter is calculated by adding together the lengths of all four sides. This results in the expression 2l + 2w, which signifies that you take the length and the width of the rectangle, multiply each by 2 to account for the opposite sides, and then sum these values for the total perimeter.

This formula is a fundamental concept in geometry and is essential for various applications, including determining fencing needed for a yard, framing for a picture, or the length of border required around a garden. Understanding this formula equips students with the tools necessary to solve practical problems that involve rectangular dimensions.