1 Answer

Swatkins · Answer 1 · 2023-04-26T14:33:21+0000

Answer: 410 square km

Explanation:

The area of each of the triangles with their base on the 10 km side is
A=(1)/(2)(10)(13.4) , so their combined area is
(10)(13.4)=134 .

The area of each of the triangles with their base on the 12 km side is
(1)/(2)(12)(13) , so their combined area is
(12)(13)=156 .

The area of the bottom rectangular face is
10(12)=120 .

So, the total surface area is
$120+156+134=\boxed{410 \text{ km}^(2)}$

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