A cuboid having a height of 21 cm is made to stand on one square face
having an area of 36cm2
. The walls of the cuboidal structure is to be
covered with metal sheet. Find the area of metal sheet needed for doing so. The top surface of the cuboid has to be painted with silver colour at
the rate of Rs.50 per cm2
.Find the cost of painting.
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Answer:
The dimensions of room is 12×8×4
The Lateral surface area is
2h(l+b)
2(4)(12+8)
8x20=160m
2
Cost of white wash is 5m
2
Total cost is 5×160-800Rs,
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