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Formula for perimeter of a rectangle how to#
Formula for perimeter of a rectangle plus#

Since the width is in feet, the length will also be in feet.įinally, the length of this rectangle is 7ft. where L and W are the length and width, respectively, of the of the rectangle. In a rectangle, opposite sides are equal in length. Note that, this number doesn't mean anything, unless we include the unit for it. The perimeter P of a rectangle is given by the formula. For the perimeter of a rectangle, we know that the perimeter is the sum of the lengths of all its sides. To do so, we add -5 to both sides of the equation.īy doing so, we get, L equals to 12 minus 5. Let's rewrite this equation so that it looks neater.

Formula for perimeter of a rectangle plus#

This gives, 24 over 2, equals to L plus 5. To do so, we divide both sides of the equation with 2. Now, to get a step closer in finding L, we need to remove '2'. Similarly, since the width is given as 5ft, we can substitute W with 5. Since the perimeter, and the width of the rectangle are given, we can find the length of the rectangle, by solving this equation for L. Find its length.Īgain, we start with the formula for the perimeter of a rectangle, P=2(L+W). Next example, the perimeter of this rectangle, is 24ft, and its width is 5ft. Therefore, the perimeter of this rectangle is equals to 14cm. Since the length, and the width, are given in centimeter, the unit for the perimeter will also be in centimeter. Now, this number doesn't mean anything, unless we include the unit for it. Similarly, since the width is given as 3cm, we can substitute W with 3. Since the length of the rectangle is given as 4cm, we can substitute, L with 4. We start with the formula for the perimeter of a rectangle, P=2(L+W). The next video will show some examples on using this formula.Īfter understanding the formula for the perimeter of a rectangle, let's see some examples on using the formula.įind the perimeter of this rectangle, when its length is 4cm, and its width is 3cm. Note that, in any calculation, when we found the value of P, it is important to include the unit.įor example, if L and W are given in centimeter, the unit for the perimeter will be in centimeter as well. Hence, by taking out '2', we have, 2(L+W). Notice that, these two terms have '2' as a common factor. Since, the perimeter of the rectangle, P, is the total distance around the outside of the rectangle, the perimeter, will be equals to L, add with W, add with another L, and finally, add with another W. This rectangle has the length of L and the width of W.

The perimeter of a square with an area of 2,025 m 2 is 180 m, because the perimeter, P, is 4 2,025 m 2, which gives us 4 ( 45 m ), which gives us 180 m.In this lesson, we will learn about the perimeter of a rectangle.Ĭonsider this rectangle.

Perimeter is always measured in linear units, which is derived from the area's square units.

To get the perimeter from the area for a square, multiply the square root of the area times 4.

The relationship between area and perimeter of a square is that perimeter is 4 times the square root of the area.

Please work through each question before checking your answers.

Please find the perimeter of this figure, a square:.

Perimeter is always measured in what type of units: linear, square, or cubic?.

Formula for perimeter of a rectangle how to#

Please explain how to get the perimeter from the area for a square.

What is the relationship between area and perimeter of a square?.

Solve these questions, then check your work against our answers below. See how well you can find your way around geometric figures. The formula works, and it works every time, with every circle. Yup, that’s a mighty big circle! But the math is correct. We start by taking a value for π as 3.14 and multiplying it times our given area: We can plug in our known area into the formula and work from the inside out. Here is a circle with an area of 1,000 k m 2. To find the circumference, C, (perimeter) of the area of a circle, A, you apply the formula:

P = 90 m i How to find perimeter of a circle with areaĪ perimeter of a circle is called the circumference of a circle. We now use our found value for length, 25 miles, in our formula for perimeter: We know our land is 20 miles wide and covers an area of 500 square miles, so we plug in what we know: Given one side length and the area, you can find the perimeter by substituting the two known values in the formulas: Let’s say we have a large rectangular plot of land. Recall that a rectangle’s area, A, in square units is w i d t h ( w ) × l e n g t h ( l ), and perimeter, P, is 2 ( w + l ), in linear units derived from the area units.

The sides of a rectangle are not equal in length, so you must know the length of at least one side. You must also know the length or width of the rectangle to produce the perimeter. You cannot find the perimeter of a rectangle given only the area of a rectangle. P = 60 y d s How to find perimeter of a rectangle with area For our pictured square, we plug in our area, find its square root, and 4 to get the total perimeter: