Q. 7−20. The, area of the rectangle below is 841 square inches. Find the perimeter. Show your work.Width is 421in.
Find Perimeter: To find the perimeter of a rectangle, we need to know both the length and the width. We already have the length, which is 421 inches. We can find the width by dividing the area by the length.
Convert to Fractions: First, let's convert the mixed numbers to improper fractions to make the calculations easier. The area is 841 square inches, which is (8×4+1)/4=433 square inches. The length is 421 inches, which is (4×2+1)/2=29 inches.
Calculate Width: Now, we divide the area by the length to find the width: (33/4)/(9/2)=(33/4)×(2/9)=33/18=11/6 inches. This is the width of the rectangle.
Perimeter Formula: The perimeter of a rectangle is given by the formula P=2(l+w), where l is the length and w is the width. We have l=29 inches and w=611 inches.
Add Fractions: Let's calculate the perimeter: P=2[(29)+(611)]. First, we need a common denominator to add the fractions. The common denominator for 2 and 6 is 6.
Find Common Denominator: Convert the length to a fraction with a denominator of 6: (29)×(33)=627 inches.Now we can add the length and width: (627)+(611)=638 inches.
Multiply by 2: Multiply the sum by 2 to find the perimeter: P=2×(638)=676 inches.
Simplify Fraction: Simplify the fraction: 676=1264 inches, and 64 can be simplified to 32, so the perimeter is 1232 inches.
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