Question

An aquarium is in the form of a cuboid whose external measures are 80 cm x 30 cm x 40cm. The base,
side face and back face are to be covered with a coloured paper. The area of the coloured paper
required is
(a) 3200 cm
(b) 4600 cm
(c) 7500 cm
(d) 8000 cm​

Answer 1

★Given :

• An aquarium is in the form of a cuboid
• Length (l) = 80 cm
• Breadth (b) = 30 cm
• Height (h) = 40 cm.
• The base,side face and back face are to be covered with a coloured paper.

★To find :

• Area of the colour paper required.

★Solution :

Front side should be visible,So it is not covered.

According to the question,

Area of the paper required = Area of the base + 2×Area of two side faces + Area of the backside

→ lb+2×bh+lh

→80×30+2×(30×40)+80×40

→2400+2×1200+3200

→2400+2400+3200

→8000 cm²

Therefore,

Area of the paper required  is 7000 cm²

∴Option(D) is correct.

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