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Total Surface Area of a Cuboid

A rectangular...

Question

A rectangular room of the dimension $8 m \times 6 m \times 3 m$ is to be painted. If it costs Rs.60 per square metre, find the cost of painting the walls of the room.

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Solution

$L e n g t h = 8 m, B r e a d t h = 6 m, H e i g h t = 3 m$
We know,
$L S A = 2 (l + b) \times h$
$L S A = 2 \times 14 \times 3 = 84 m^{2}$
Therefore, cost of painting = $84 \times 60 = R s . 5040$ .

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