The surface area of a cuboid is the sum of all the areas of all its faces: 2 ends + 2 fronts + 2 tops = 2 x (area_of_end + area_of_front + area_of_top).
For a 2cm x 3cm x 5cm cuboid, the surface area is:
2 x (2 x 3 + 2 x 5 + 3 x 5) cm3
= 2 x (6 + 10 + 15) cm3
= 2 x 31 cm3
= 62 cm3
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The perimeter would be 40cm.
The area of a square is 54 centimeters? That is impossible! The centimeter is a measurement of length. But a square containing 54 square centimeters would have sides of 7.348469 cm.
Then the surface area of the solid would be measured in square feet
Completing the square would be the same as "Finding the square root" So an example would be 16. 16 is a perfect square so it would reduce to 4.
If you are looking for the square footage of the room, the height shouldn't make a difference. So the square footage would just be 10 ft x 10 ft = 100 square feet. If you are looking for surface area of all the walls, floor, and ceiling, that would be 100+100+80+80+80+80 = 520 square feet If you're looking for the cubic footage of the room, then you would use all three dimensions. 8ft x 10ft x 10ft = 800 cubic feet.