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

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

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