What is the formula for the perimeter of a rectangle?

The formula for the perimeter of a rectangle is expressed as 2 times the sum of its length and width. This means that to calculate the perimeter, you first add the length of the rectangle to the width, and then multiply that total by 2. The reason for multiplying by 2 is that a rectangle has two lengths and two widths, so you are effectively accounting for all four sides of the rectangle.

This formula can be visualized as follows: if you imagine a rectangle drawn on a piece of paper, the perimeter represents the total distance around its edges. By adding the two distinct pairs of sides (length and width) together and then doubling that value, you obtain the complete measurement around the rectangle.

In the choices given, the only one that correctly incorporates this logic by adding both dimensions first and then doubling the result is the one that states perimeter equals 2 times the sum of the length and width. This formula is universally applicable to any rectangle, regardless of the specific measurements of its sides.