Big Ideas Math: Modeling Real Life, Grade 6
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Big Ideas Math: Modeling Real Life, Grade 6 View details
6. Dividing Whole Numbers
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Exercise 33 Page 86

Use the formulas for perimeter and area of a rectangle.

42ft

Practice makes perfect

Let's take a look at the given rectangle.

From the figure, we know that the length is equal to 12 feet and the area is 108 square feet. The area of a rectangle is equal to the product of the length and the width of the rectangle. A= l * w Because we know the value of the area and the length, we can substitute these values into the above formula. 108 ft^2= 12 ft* w Note that the value of w must be 9 feet to satisfy the area is 108 square feet and the length is 12 feet. Now that we have all the dimensions, we can find its perimeter using the following formula. P=2l+2w In this formula, l is the length and w is the width. From the picture, we know that l is equal to 12, and w is equal to 9. Substituting these values into the formula, we can calculate P.

P=2l+2w
P=2( 12)+2( 9)
P=24+18
P=42

The rectangle's perimeter is 42 feet.