Right off the bat, we can see that the value of the perimeter is 101 ft and that the length is defined using the width as given in the following statement. If the perimeter of the rectangle is 101 feet, how long is the length of the rectangle? If the left and the right side of the equation both equal each other, then our answers are correct.Įxample 4: The length of the rectangle is 12.5 feet more than the width. For this problem, we simply have to substitute the values of L, W, and P in the perimeter formula. I advise my students to always check their answers no matter how confident they feel that they got the correct one. Since the problem is asking us to find the dimensions for both the length and the width, let’s use the value of L to also get the value for the width.Īnswer: The length of the rectangle is 35 meters and the width is 12 meters. Let’s construct a diagram to get a better visual of all the information that we have so far. So in this case, we will keep the variable L to stand for the length. How about the length? Well, at this time, our length is unknown. So if ( W) stands for the width and ( L) is for the length, our algebraic expression for the width is, We need to translate the algebraic sentence above into an algebraic expression so we can substitute it for the width in the perimeter formula. The width of the rectangle is 23 meters less than the length. On the other hand, the width of the rectangle is expressed in terms of length. In our problem, we can easily spot the value of the perimeter ( P) which is 94 meters. Find the dimensions of the rectangle.įor us to solve this word problem, we need to be able to substitute values or expressions to the L, W, and P variables of the perimeter formula, P=2L+2W. The perimeter of the rectangle is 94 meters.
#Perimeter of a rectangle how to
Knowing how to find the perimeter of a rectangle is a helpful skill in everyday life.Part 2 Answer: The perimeter of the rectangle is 432 inches.Įxample 3: The width of a rectangle is 23 meters less than the length.
Schools are building-block assemblages of rectangular prisms.
#Perimeter of a rectangle windows
Homes are essentially rectangular prisms with rectangular windows and doors. Maybe some other civilizations may have sprung up around circles, ovals, and spheres, but our world is dominated by rectangles, squares (which are special rectangles), and the three-dimensional forms you can build with them. Working hard through this lesson, you are now able to define perimeter, recall and apply two formulas for finding the perimeter of a rectangle and solve word problems involving perimeter of rectangles. Plug 11.75 cm into the x values, and check:ĭo not lose your unit of measure as you work through the problem all perimeter is measured in the same linear unit you used for each side. Combine like terms subtract 2 from both sides, and divide: You can still use both formulas, but you have to simplify along the way.
Side B R is 3 x - 4 long, and side B G is x + 5 wide. Rectangle B R A G has a perimeter of 96 cm.
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