Question

find the surface area of the figure. 10 ft 10 ft 4 ft 360 ft² 200 ft² 400 ft² 160 ft²

Explanation:

Step1: Identify 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, $l = 4$ ft, $w = 10$ ft, and $h = 10$ ft.

Step2: Calculate $lw$

$lw=4\times10 = 40$ ft²

Step3: Calculate $lh$

$lh = 4\times10=40$ ft²

Step4: Calculate $wh$

$wh=10\times10 = 100$ ft²

Step5: Substitute into formula

$SA=2(40 + 40+100)$
$SA=2\times180$
$SA = 360$ ft²

Answer:

$360$ ft²