Question

The length,breadth and height of a cuboid are 15 m, 6 m, and 5 dm respectively. The lateral surface area of the cuboid is

$\left(a\right)45c{m}^2\left(b\right)21c{m}^2\left(c\right)201c{m}^2\left(d\right)90c{m}^2$

Answer 1

ANSWER:
Length of the cuboid, l = 15 m
Breadth of the cuboid, b = 6 m
Height of the cuboid, h = 5 dm = 0.5 m $\because (1m=10dm)$
Lateral surface area of the cuboid = 2h (l + b) = 2 × 0.5 × (15 + 6) = 2 × 0.5 × 21 = 21 $c{m}^2$

Hence, the correct answer is option (b)