Question

Surface area of cuboid

Answer 1

Volume equals 60

Explanation:

volume = (width)(height)(length)

volume= (2.5)(4)(6)

volume= 60

Answer 2

The amount of glass used is equivalent to the surface area of the glass surfaces.

As the problem is specifying the top of the aquarium is open, we'll assume that it is not included for the surface area calculations.

`A=2 (2.5 * 4) +2(6*4)+(6*2.5)`

The first term represents the area of two 2.4 x 4 faces of the aquarium. The second term is the area for the two 6 x 4 faces. The last term is for the 6 x 2.5 base of the aquarium, and it is not multiplied by 2 as we are not including the top of the aquarium.

`=2 * 10 + 2*24 + 15`

`=83 \text{ ft}^2`

The aquarium has a surface area of 83 square feet. Hence, 83 square feet of glass was used to build the tank.

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