Basic Math Examples

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

Step 1

The surface area of a pyramid is equal to the sum of the areas of each side of the pyramid. The base of the pyramid has area $l w$ , and $s_{l}$ and $s_{w}$ represent the slant height on the length and slant height on the width.

$(l e n g t h) \cdot (w i d t h) + (w i d t h) \cdot s_{l} + (l e n g t h) \cdot s_{w}$

Step 2

Substitute the values of the length $l$ , the width $w$ , and the height $h$ into the formula for surface area of a pyramid.

$l \cdot w + w \cdot \sqrt{{(\frac{l}{2})}^{2} + {(h)}^{2}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3

Simplify each term.

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Step 3.1

Apply the product rule to $\frac{l}{2}$ .

$l w + w \cdot \sqrt{\frac{l^{2}}{2^{2}} + {(h)}^{2}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.2

Raise $2$ to the power of $2$ .

$l w + w \cdot \sqrt{\frac{l^{2}}{4} + {(h)}^{2}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.3

To write $h^{2}$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$l w + w \cdot \sqrt{\frac{l^{2}}{4} + h^{2} \cdot \frac{4}{4}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.4

Combine $h^{2}$ and $\frac{4}{4}$ .

$l w + w \cdot \sqrt{\frac{l^{2}}{4} + \frac{h^{2} \cdot 4}{4}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.5

Combine the numerators over the common denominator.

$l w + w \cdot \sqrt{\frac{l^{2} + h^{2} \cdot 4}{4}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.6

Move $4$ to the left of $h^{2}$ .

$l w + w \cdot \sqrt{\frac{l^{2} + 4 h^{2}}{4}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.7

Rewrite $\frac{l^{2} + 4 h^{2}}{4}$ as ${(\frac{1}{2})}^{2} (l^{2} + 4 h^{2})$ .

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Step 3.7.1

Factor the perfect power $1^{2}$ out of $l^{2} + 4 h^{2}$ .

$l w + w \cdot \sqrt{\frac{1^{2} (l^{2} + 4 h^{2})}{4}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.7.2

Factor the perfect power $2^{2}$ out of $4$ .

$l w + w \cdot \sqrt{\frac{1^{2} (l^{2} + 4 h^{2})}{2^{2} \cdot 1}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.7.3

Rearrange the fraction $\frac{1^{2} (l^{2} + 4 h^{2})}{2^{2} \cdot 1}$ .

$l w + w \cdot \sqrt{{(\frac{1}{2})}^{2} (l^{2} + 4 h^{2})} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.8

Pull terms out from under the radical.

$l w + w \cdot (\frac{1}{2} \sqrt{l^{2} + 4 h^{2}}) + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.9

Rewrite using the commutative property of multiplication.

$l w + \frac{1}{2} w \sqrt{l^{2} + 4 h^{2}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.10

Combine $\frac{1}{2}$ and $w$ .

$l w + \frac{w}{2} \sqrt{l^{2} + 4 h^{2}} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.11

Combine $\frac{w}{2}$ and $\sqrt{l^{2} + 4 h^{2}}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{{(\frac{w}{2})}^{2} + {(h)}^{2}}$

Step 3.12

Apply the product rule to $\frac{w}{2}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2}}{2^{2}} + {(h)}^{2}}$

Step 3.13

Raise $2$ to the power of $2$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2}}{4} + {(h)}^{2}}$

Step 3.14

To write $h^{2}$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2}}{4} + h^{2} \cdot \frac{4}{4}}$

Step 3.15

Combine $h^{2}$ and $\frac{4}{4}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2}}{4} + \frac{h^{2} \cdot 4}{4}}$

Step 3.16

Combine the numerators over the common denominator.

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2} + h^{2} \cdot 4}{4}}$

Step 3.17

Move $4$ to the left of $h^{2}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{w^{2} + 4 h^{2}}{4}}$

Step 3.18

Rewrite $\frac{w^{2} + 4 h^{2}}{4}$ as ${(\frac{1}{2})}^{2} (w^{2} + 4 h^{2})$ .

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Step 3.18.1

Factor the perfect power $1^{2}$ out of $w^{2} + 4 h^{2}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{1^{2} (w^{2} + 4 h^{2})}{4}}$

Step 3.18.2

Factor the perfect power $2^{2}$ out of $4$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{\frac{1^{2} (w^{2} + 4 h^{2})}{2^{2} \cdot 1}}$

Step 3.18.3

Rearrange the fraction $\frac{1^{2} (w^{2} + 4 h^{2})}{2^{2} \cdot 1}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot \sqrt{{(\frac{1}{2})}^{2} (w^{2} + 4 h^{2})}$

Step 3.19

Pull terms out from under the radical.

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + l \cdot (\frac{1}{2} \sqrt{w^{2} + 4 h^{2}})$

Step 3.20

Rewrite using the commutative property of multiplication.

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{1}{2} l \sqrt{w^{2} + 4 h^{2}}$

Step 3.21

Combine $\frac{1}{2}$ and $l$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{l}{2} \sqrt{w^{2} + 4 h^{2}}$

Step 3.22

Combine $\frac{l}{2}$ and $\sqrt{w^{2} + 4 h^{2}}$ .

$l w + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{l \sqrt{w^{2} + 4 h^{2}}}{2}$

Step 4

To write $l w$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$l w \cdot \frac{2}{2} + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{l \sqrt{w^{2} + 4 h^{2}}}{2}$

Step 5

Combine $l w$ and $\frac{2}{2}$ .

$\frac{l w \cdot 2}{2} + \frac{w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{l \sqrt{w^{2} + 4 h^{2}}}{2}$

Step 6

Combine the numerators over the common denominator.

$\frac{l w \cdot 2 + w \sqrt{l^{2} + 4 h^{2}}}{2} + \frac{l \sqrt{w^{2} + 4 h^{2}}}{2}$

Step 7

Combine the numerators over the common denominator.

$\frac{l w \cdot 2 + w \sqrt{l^{2} + 4 h^{2}} + l \sqrt{w^{2} + 4 h^{2}}}{2}$

Step 8

Reorder factors in $l w \cdot 2 + w \sqrt{l^{2} + 4 h^{2}} + l \sqrt{w^{2} + 4 h^{2}}$ .

$\frac{2 l w + w \sqrt{l^{2} + 4 h^{2}} + l \sqrt{w^{2} + 4 h^{2}}}{2}$