The line from the dot to the edge of the circle is called the radius. Instead of needing to know the measurement of a side, you need to know the radius or diameter of the circle. That is why we can’t use the same perimeter formula for a circle. If someone asked you the question:Īctually, a circle doesn’t have any sides. Now, the formula for the perimeter for a circle is a little different. That was quite easy, but not all shapes use this formula for the perimeter.
It will be just enough ribbon to wrap one time around this box. We can wrap that amount of ribbon around the box. The perimeter of the square is 96 inches. So, we can set up the problem below to find the perimeter of it. So, we only need to know one side of the square.
Every side on a square is equal in length. You may see that we only have the measurement for one side of our square. Below shows the measurement for one side of the box. You want to cut just enough ribbon to go around the square box. Side + side + side + side = perimeter Example You add the lengths of each side together. The formula of the square, triangle, rectangle, and really any other shape (that is not a circle) is quite simple. Unfortunately, the circle requires a few more steps to find its perimeter. It is rather easy to find the perimeter of most shapes. Now, I promised you that it would be easy to find the perimeter of a shape. Finding the Perimeter of Shapes with Sides Once we have the lengths of each side, we are good to go!įACT: Many people have to find the perimeter almost every time they are fencing in a yard. The only way to find the measurement of an unknown side is to cross your fingers that it is equal to another side, and we have the measurement of that equal side. If we don’t know or can’t find how long a side is, then we are in trouble. We must know how long each side of the shape is. We can find the perimeter of triangles, rectangles, squares, and, yes, even circles.Ĭircles are a little more difficult when it comes to finding the perimeter, but we will talk about that later. The good news is that we can find the perimeter of any shape, and it is pretty easy to do. In this case, we have the measurements of the sides that we need. The other part that we need is the measurements for all of the sides. At this point, we have the name of the shape which is the rectangle. The other two sides are also 30 feet and 15 feet.
One side of the rectangle has a measurement of 30 feet, and the shorter side of the rectangle measures 15 feet. This is all we need to find the perimeter. We measure the long side of the rectangle, and it measures 30 feet, and the short side of the rectangle measures 15 feet. We really don’t need to measure each side of the rectangle since a rectangle has two equal sides.īelow is a picture of a backyard that has a rectangle shape like your yard. Let’s say that your yard is in the shape of a rectangle. Then we will need to know the measurement of each side.īack to your yard. So, it is helpful to identify the shape first. That is because the perimeter is the measurement of the boundary of a shape. When we measure the border of a shape, we can get Then we will know how much fencing to buy. We will need to find the perimeter of your yard first before we can start building the fence. To do this, we will need to know how much fencing to buy. Since the puppy will need to run and play in your backyard, we will need to build a fence around your backyard. Imagine you just got a puppy for your birthday.
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