Ace the GED Math Test 2026 – Conquer Numbers and Unlock Your Future!

The formula for the perimeter of a rectangle is derived from the basic definition of perimeter, which is the total distance around a shape. For a rectangle, the perimeter can be calculated by adding together all four sides.

A rectangle has two lengths (l) and two widths (w). To find the perimeter, you would sum the lengths and widths as follows:

Perimeter = Length + Width + Length + Width

This can be simplified to:

Perimeter = 2l + 2w

Thus, this formula effectively captures the total distance around the rectangle by accounting for both pairs of opposite sides.