Find the Surface Area box (15)(15)(15)

 $\begin{array}{r} h = & 15 \\ l = & 15 \\ w = & 15 \end{array}$

The surface area of a box is equal to the sum of the areas of each side of the box.

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

Substitute the values of the length $l = 15$ , the width $w = 15$ , and the height $h = 15$ into the formula.

$2 \cdot 15 \cdot 15 + 2 \cdot 15 \cdot 15 + 2 \cdot 15 \cdot 15$

Simplify each term.

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Multiply $2$ by $15$ .

$30 \cdot 15 + 2 \cdot 15 \cdot 15 + 2 \cdot 15 \cdot 15$

Multiply $30$ by $15$ .

$450 + 2 \cdot 15 \cdot 15 + 2 \cdot 15 \cdot 15$

Multiply $2$ by $15$ .

$450 + 30 \cdot 15 + 2 \cdot 15 \cdot 15$

Multiply $30$ by $15$ .

$450 + 450 + 2 \cdot 15 \cdot 15$

Multiply $2$ by $15$ .

$450 + 450 + 30 \cdot 15$

Multiply $30$ by $15$ .

$450 + 450 + 450$

Simplify by adding numbers.

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Add $450$ and $450$ .

$900 + 450$

Add $900$ and $450$ .

$1350$

Find the Surface Area box (15)(15)(15)

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