wikiHow Finding the Perimeter of Rectangle Practice Problems 1. Determine the length and width of the rectangle. 2. Add the length and width together. 3. Multiply the sum by 2. Here's an example to help illustrate the process: Length = 8 units Width = 6 units Step 1: Determine the length and width of the rectangle, which are 8 units and 6 units, respectively. Step 2: Add the length and width together. 8 + 6 = 14 Step 3: Multiply the sum by 2. 14 x 2 = 28 So the perimeter of the rectangle is 28 units. Alternatively, you can use an online rectangle perimeter calculator to quickly find the perimeter of a rectangle by inputting the length and width. Page