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The surface of a workbook is $11$ inches tall and $9$ inches wide. What is its perimeter? $\newline$ $\_\_\_\_$ inches

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Area and perimeter: word problems

Full solution

Q. The surface of a workbook is

11

inches tall and

9

inches wide. What is its perimeter?

\newline

\_\_\_\_

inches

Understand Formula: Understand the formula for the perimeter of a rectangle. The formula for the perimeter $P$ of a rectangle is $P = 2(\text{length} + \text{width})$ .
Plug in Values: Plug in the values for length and width into the formula. $\newline$ In this case, the length is $11$ inches and the width is $9$ inches. $\newline$ $P = 2(11 \text{ inches} + 9 \text{ inches})$
Perform Addition: Perform the addition inside the parentheses. $\newline$ $11$ inches + $9$ inches = $20$ inches
Multiply to Find Perimeter: Multiply the sum by $2$ to find the perimeter. $\newline$ $P = 2 \times 20$ inches $\newline$ $P = 40$ inches

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