An aquarium is in the form of a cuboid whose external measures are 80cm×30cm×40cm. The base side faces and back face are to be covered with colored paper. Find the area of the paper needed?

Given data:
Length of box (l) = 80cm.
Breadth of box (b)=

30 cm

.
Height of box (h)=

40 cm

.
The box is drawn from the given data. It is in cuboid shape.

The area of cuboid box is 2(l

\times

b) + 2(b

\times

h) + 2(l

\times

h).
Area of paper required = area of base

+

2 area of side to be covered

+

area of back.
⟹ (l

\times

b) + 2 (b

\times

h) + (l

\times

⟹ (80 \times 30) + 2 (30 \times 40) + (80 \times 40)

⟹ 2400 + 2400 + 3200

⟹ {8000 cm}^{2}

Hence, the area of the box to be covered is 8000cm2.
Therefore, option 3 is correct.

An aquarium is in the form of a cuboid whose external measures are $80 cm \times 30 cm \times 40 cm$ . The base side faces and back face are to be covered with colored paper. Find the area of the paper needed?