Sum

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

(i) total surface area

(ii) lateral surface area

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#### Solution

Length of a cuboid = 8 m

The 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 m^{2}

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

= 2 x 3.5(8 + 12) = 7 x 20= 140 m^{2}

Concept: Surface Area of a Cuboid

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