Question

what is the surface area of this rectangular 12 ft. 6 ft. 11 ft. square feet

Explanation:

Step1: Recall surface - area formula

The surface - area formula for a rectangular prism is $SA = 2(lw+lh + wh)$, where $l$ is length, $w$ is width, and $h$ is height. Here, $l = 11$ ft, $w = 6$ ft, and $h = 12$ ft.

Step2: Calculate $lw$

$lw=11\times6 = 66$ square feet.

Step3: Calculate $lh$

$lh=11\times12 = 132$ square feet.

Step4: Calculate $wh$

$wh=6\times12 = 72$ square feet.

Step5: Substitute into formula

$SA = 2(66 + 132+72)$.
First, add the values inside the parentheses: $66 + 132+72=270$.
Then, multiply by 2: $SA = 2\times270=540$ square feet.

Answer:

540