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Find the Perimeter rectangle (9)(9)

 $\begin{array}{r} l = & 9 \\ w = & 9 \end{array}$

Step 1

The perimeter of a rectangle is equal to the sum of all sides of the rectangle.

$l e n g t h + l e n g t h + w i d t h + w i d t h = 2 \cdot (l e n g t h) + 2 \cdot (w i d t h)$

Step 2

Substitute the values of the length $l = 9$ and width $w = 9$ into the formula for the perimeter of a rectangle.

$2 \cdot 9 + 2 \cdot 9$

Step 3

Simplify each term.

Multiply $2$ by $9$ .

$18 + 2 \cdot 9$

Multiply $2$ by $9$ .

$18 + 18$

$18 + 18$

Step 4

Add $18$ and $18$ .

$36$

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