Question:
Find the lateral surface area and total surface area of a cuboid of length 80 cm, breadth 40 cm and height 20 cm.
Solution:
Given that:
Cuboid length (l) = 80 cm
Breadth (b) = 40 cm
Height (h) = 20 cm
We know that,
Total Surface Area = 2[lb + bh + hl]
= 2[(80)(40) + (40)(20) + (20)(80)]
= 2[3200 + 800 + 1600]
= 2[5600]
$=11200 \mathrm{~cm}^{2}$
Lateral Surface Area = 2[l + b]h
= 2[80 + 40]20
= 40[120]
$=4800 \mathrm{~cm}^{2}$
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