The total surface area of the cuboid is km². Therefore, option A is the correct answer.
The given dimensions are length=19 km, width=18 km and height=18 km.
We need to find the total surface area of the given cuboid.
What is the formula to find the total surface area?
Total surface area is the sum of the areas of all faces (or surfaces) on a 3D shape. A cuboid has 6 rectangular faces. To find the surface area of a cuboid, add the areas of all 6 faces. We can also label the length (l), width (w), and height (h) of the prism and use the formula, TSA=2lw+2lh+2hw, to find the surface area.
Now, TSA = 2(18)(18) + 2(18)(19) + 2(19)(18)
TSA = 648 + 684 + 684=2016 km²
The total surface area of the cuboid is km². Therefore, option A is the correct answer.
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