Basic Math Examples



\begin{matrix} l = & 9 w = & 9 \end{matrix}

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

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)

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

Step 2

Substitute the values of the length

l = 9

$l = 9$ and width

w = 9

$w = 9$ into the formula for the perimeter of a rectangle.

2 \cdot 9 + 2 \cdot 9

$2 \cdot 9 + 2 \cdot 9$

Step 3

Simplify each term.

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Step 3.1

Multiply

2

$2$ by

9

$9$ .

18 + 2 \cdot 9

$18 + 2 \cdot 9$

Step 3.2

Multiply

2

$2$ by

9

$9$ .

18 + 18

$18 + 18$

18 + 18

$18 + 18$

Step 4

Add

18

$18$ and

18

$18$ .

36

$36$