FTCE General Knowledge Math Practice Test

How do you calculate the perimeter of a rectangle?

1. Length + Width

2. 2(Length + Width)

3. Length X Width

4. 2(Length X Width)

The correct answer is: 2(Length + Width)

To calculate the perimeter of a rectangle, you use the formula that sums up the lengths of all four sides. The perimeter can be defined as twice the sum of the length and the width, which means you add the length and width together and then multiply that sum by 2. This accounts for both the opposite sides of the rectangle. Therefore, the option that states "2(Length + Width)" accurately represents this calculation. Using this formula ensures that you include both sets of lengths and widths, yielding the total measurement around the rectangle. The other formulas either do not account for both dimensions appropriately or do not relate to the concept of perimeter.