Question

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

Answer 1

Answer:

Area of paper required = area of base + 2 area of side + area of back

=(80×30)+2(30×40)+(80×40)

=2400+2400+3200

=8000cm²

Answer 2

Given :-

• Length of the aquarium = 80 cm

• Breadth of the aquarium = 30 cm

• Height of the aquarium = 40 cm

To Find :-

• Area of the paper needed.

Solution :-

Area of the base :-

➜   length × breadth

➜   80 × 30

➜   2400 cm²

Area of the side face :-

➜   breadth × height

➜   30 × 40

➜   1200 cm²

Area of the back face :-

➜   length × height

➜   80 × 40

➜   3200 cm²

Area of the paper :-

➲  Area of base + Area of back face + (2 × Area of side face)

➲  2400 + 3200 + (2 × 1200)

➲  8000 cm²

∴  Area of coloured paper required = 8000 cm²