We will use the rectangle from the previous example. To find the area of a rectangle, you will start by finding the dimensions of your shape. Here are the formulas for other common shapes: So, for the guided example, you would add 3 + 3 + 5 + 5 to get a perimeter of 16 feet (4.9 m). One a piece of scratch paper, or on the paper you have written the guided example, write: length + length + width + width. Rectangles have four sides, but the length of opposite sides will be the same.Īdd all your sides together. Write down the correct measurements on the opposing sides of your rectangle. In this example, we found the length of the rectangle to be 5 feet or 152 centimeters. Write down the value for your width next to the horizontal side of your rectangle it represents. Then, find the width of one side of your rectangle. In this example, we found the length of the rectangle to be 3 feet or 92 centimeters. Write down this number by the side it represents so you don't forget its length. You can do this with a ruler, measuring tape, or by making up your own example.
Find the length of one side of your rectangle. We can use a rectangle on a piece of paper as an example. To measure the perimeter of a rectangle, you will want to measure each side of the rectangle. The perimeter is the length of the entire outside boundary of a polygon, and the area is the measure of the space that fills the boundaries of a polygon. X Research source X Research sourceįinding the area and perimeter of a shape can be extremely useful not only in math, but for household projects, construction, and DIY projects. The term "radius" refers to the distance between the center of a circle and its outside boundary (perimeter), while "diameter" refers to the length between any two opposite points on the perimeter of a circle that pass through the circle's center.If not, you can approximate the value of π as 3.14. If you have a π key on your calculator, you can use it to be more accurate when using this formula. The π symbol stands for Pi (pronounced like pie).Circle: 2 x π x radius OR π x diameter.But you can also use the following formulas to find the perimeters of other common shapes: In real life examples, you can measure the outside boundary of any closed geometric shape to find its perimeter measurement. Unfortunately, different shapes will require different formula for you to solve for perimeter. Adjust your approach for different shapes.
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