<human>: Goal: how to find perimeter of a rectangle

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- Perimeter = 2 X Lengths + 2 X Widths + 2 x lengths    P = 2l + 2w
- Perimeter = 2 X Lengths + 2 X Widths    P = 2l + 2w
<bot>: Perimeter = 2 X Lengths + 2 X Widths    P = 2l + 2w