Question

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

Answer 1

Length of cuboid (l) = 80 cm

Breadth (b) = 40 cm

Height (h) 20 cm

(i) $\therefore \text{Lateral surface area}=2h(l+b)$

$=2\times 20(80+40)c{m}^2$

$=40\times 120=4800c{m}^2$

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

$=2(80\times 40+40\times 20+20\times 80)c{m}^2$

$=2(3200+800+1600)c{m}^2$

$=5600\times 2=11200c{m}^2$