Find the Surface Area box (9)(9)(9)



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

Step 1

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

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

Step 2

Substitute the values of the length

$l = 9$ , the width

$w = 9$ , and the height

$h = 9$ into the formula.

$2 \cdot 9 \cdot 9 + 2 \cdot 9 \cdot 9 + 2 \cdot 9 \cdot 9$

Step 3

Simplify each term.

Multiply

$2 \cdot 9 \cdot 9$ .

Multiply

$2$ by

$9$ .

$18 \cdot 9 + 2 \cdot 9 \cdot 9 + 2 \cdot 9 \cdot 9$

Multiply

$18$ by

$9$ .

$162 + 2 \cdot 9 \cdot 9 + 2 \cdot 9 \cdot 9$

Multiply

$2 \cdot 9 \cdot 9$ .

Multiply

$2$ by

$9$ .

$162 + 18 \cdot 9 + 2 \cdot 9 \cdot 9$

Multiply

$18$ by

$9$ .

$162 + 162 + 2 \cdot 9 \cdot 9$

Multiply

$2 \cdot 9 \cdot 9$ .

Multiply

$2$ by

$9$ .

$162 + 162 + 18 \cdot 9$

Multiply

$18$ by

$9$ .

$162 + 162 + 162$

Step 4

Simplify by adding numbers.

Add

$162$ and

$162$ .

$324 + 162$

Add

$324$ and

$162$ .

$486$

Find the Surface Area box (9)(9)(9)

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