Finding the perimeter of a rectangle is one of the easiest first steps towards becoming a geometry genius. The formula is simple and quick, and with a little practice, you’ll be finding the perimeter of every rectangle in sight!
So what is the perimeter of a shape, exactly? Picture a large, grassy field with a fence around the outside. The fence represents the perimeter – it’s just the outermost boundaries of the shape. When we calculate the perimeter, we’re looking for how long the distance around the shape is.
The formula used to calculate the perimeter of a rectangle is 2(l + w). L stands for length, which is found by measuring the longer side of the rectangle. W stands for width, which is found by measuring the shorter side of the rectangle. Let’s say the length of a rectangular field is 10 feet, and the width is 5 feet. To find the perimeter of the rectangle, we would add 5 and 10, which equals 15. To finish the equation, we would multiply 15 by 2 for a grand total of 30 feet. It’s really that simple, but if it still doesn’t make sense we would recommend speaking with an online math tutor.
Now that you know how to calculate the perimeter of a rectangle, practice on any rectangle you can find. Your computer screen, your kitchen table, and your windows are just a few that are right inside your house. You’ll be a perimeter master in no time! Ready for another challenge? Check out this guide to measuring the volume of a cylinder.