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Question

Find the lateral surface area and total surface are of a cuboid of length 80 cm, breadth 40 cm and height 20 cm.

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Solution

Length of cuboid (l) = 80 cm

Breadth (b) = 40 cm

Height (h) 20 cm

(i) Lateral surface area = 2h(l+b)

=2×20(80+40) cm2

=40×120=4800 cm2

(ii) Total surface area = 2(lb+bh+hl)

=2(80×40+40×20+20×80) cm2

=2(3200+800+1600) cm2

=5600×2=11200 cm2


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