Question

what is the surface area?
13 yd
7 yd
40 yd
square yards
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Explanation:

Step1: Recall surface area formula

The surface area of a rectangular prism is given by:
$$SA = 2(lw + lh + wh)$$
where $l=13$ yd, $w=7$ yd, $h=40$ yd.

Step2: Calculate each pair product

First compute $lw$, $lh$, $wh$:
$lw = 13 \times 7 = 91$
$lh = 13 \times 40 = 520$
$wh = 7 \times 40 = 280$

Step3: Sum the products

Add the three results together:
$91 + 520 + 280 = 891$

Step4: Multiply by 2

Multiply the sum by 2 to get total surface area:
$SA = 2 \times 891 = 1782$

Answer:

1782 square yards