The total surface area of a cuboid of length 90 cm, breadth 50 cm and height 4 m is:
Answer & explanation
Correct answer: option 4
We know that,
Total surface area of a cuboid = 2 × {length × breadth + length × height + breadth × height}
Given,
The length = 90cm
breadth = 50cm
and height = 4m
The total surface area of the given cuboid = 2 × {0.9 × 0.5 + 0.9 × 4 + 0.5 × 4}
= 2 × {0.45 + 3.6 + 2}
= 2 × 6.05 = 12.1 m2