Basic Math Examples

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\begin{array}{r} l = & 5 \\ w = & 4 \end{array}

$\begin{array}{r} l = & 5 \\ w = & 4 \end{array}$

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 = 5

$l = 5$ and width

w = 4

$w = 4$ into the formula for the perimeter of a rectangle.

2 \cdot 5 + 2 \cdot 4

$2 \cdot 5 + 2 \cdot 4$

Step 3

Simplify each term.

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Step 3.1

Multiply

2

$2$ by

5

$5$ .

10 + 2 \cdot 4

$10 + 2 \cdot 4$

Step 3.2

Multiply

2

$2$ by

4

$4$ .

10 + 8

$10 + 8$

10 + 8

$10 + 8$

Step 4

Add

10

$10$ and

8

$8$ .

18

$18$