Question

A cuboid is 8 m long, 12 m broad and 3.5 high, Find its 

(i) total surface area 

(ii) lateral surface area

Answer 1

Length of a cuboid = 8 m 

Breadth of a cuboid = 12 m

Height of a cuboid = 3.5 m

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

= 2(8 x 12 + 12 x 3.5 + 3.5 x 8) 

= 2(96 + 42 + 28) 

= 2 x 166 = 332 m² 

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

= 2 x 3.5(8 + 12) = 7 x 20= 140 m²