Simply add the length and width togther and then multiply the result by 2. The formula for the perimeter of a rectangle is Perimeter = 2 × (length + width). Since there are two lengths and two widths, we double this to get 10 cm. We can add the length and width together and then double this result because there are two of them.Īdding the length and the width, we have 2 + 3 = 5 cm. There are two lengths and two widths on a rectangle. This is because there are two widths, which are marked below. To find the perimeter of a rectangle, simply add the length and the width together and then multiply this result by 2. There is a quicker method for working out the perimeter of a rectangle when given the length and the width. This means that the total distance around the outside of the shape is 10 cm. Therefore the perimeter of this rectangle is 10 cm. Once the lengths of all of the sides of a shape are labelled, the perimeter can be found by adding these lengths together. If the top side of the rectangle is 3 cm, then so is the bottom side. Therefore if the left side of the rectangle is 2 cm, then so is the right side. The opposite sides of a rectangle are the same length. We are told the length and the width of this rectangle. Here is an example of finding the perimeter of a rectangle when only given 2 of its sides. Here are some of the most common units that perimeter is measured in. It is found by adding up all of the outside lengths of a shape. Perimeter is the total distance around the outside of a shape. Alternatively, add the length and width of the rectangle together and then double this result. Total time taken = Total distance walked × time taken to walk 1m.To find the perimeter of a rectangle add up the lengths of all four sides. Total distance walked = 5 × Perimeter of the park. If he walks 100m in 5 minutes, how long will it take for him in total? If the size of the park is 100m by 50m, find the distance the boy has walked. Perimeter of rectangle = 2(length + breadth)Įxample 6: Find the perimeter of rectangle whose length is 6 inches and width is 4 inches.Įxample 7: A boy walks 5 times around a park. Perimeter = 2(b) + 2(h) = 2(4) + 2(3) = 8 + 6 = 14.Įxample 5: Calculate the perimeter of the rectangle whose length is 18cm and breadth 7cm Now, substituting these values in the formula for perimeter, we will getĮxample 3: Find the area and the perimeter of a rectangle whose length is 24 m and width is 12m?Įxample 4: Find the area and perimeter of a rectangle whose breadth is 4 cm and the height 3 cm. Therefore, the dimensions are 5cm and 3cm. Note that the value of x must be positive and therefore in our case, the value of x is 2. We can substitute the expressions for length and width into the equation for area in order to determine the value of x. Since the area of a rectangle is given by: We know that the dimensions of the rectangle in terms of x: If its area is 15 cm 2, what are the rectangle's dimensions and what is its perimeter? Thus, the perimeter of the rectangle is 42 cm.Įxample 2: If a rectangle's length is 2x + 1 and its width is 2x – 1. Perimeter of the rectangle = 2(l + w) units The perimeter of a rectangle is the total length of all the four sides.Įxample 1: Rectangle has the length 13 cm and width 8 cm. A rectangle is 2-dimensional however, perimeter is 1-dimensional and is measured in linear units such as feet or meter etc. In rectangle, the distance around the outside of the rectangle is known as perimeter.
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