Pre-Algebra Examples



\begin{array}{r} l = & 4 ft \\ w = & 3 ft \end{array}

$\begin{array}{r} l = & 4 ft \\ w = & 3 ft \end{array}$

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 = 4

$l = 4$ and width

w = 3

$w = 3$ into the formula for the perimeter of a rectangle.

2 \cdot 4 + 2 \cdot 3

$2 \cdot 4 + 2 \cdot 3$

Step 3

Simplify each term.

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Step 3.1

Multiply

2

$2$ by

4

$4$ .

8 + 2 \cdot 3

$8 + 2 \cdot 3$

Step 3.2

Multiply

2

$2$ by

3

$3$ .

8 + 6

$8 + 6$

8 + 6

$8 + 6$

Step 4

Add

8

$8$ and

6

$6$ .

14 ft

$14 ft$



\begin{array}{r} l = & 4 f t \\ w = & 3 f t \end{array}

$\begin{array}{r} l = & 4 f t \\ w = & 3 f t \end{array}$

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