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Standard VIII

Mathematics

Total Surface Area of a Cuboid

The internal ...

Question

The internal dimensions of a room are 15 m x 9 x 5 M the measurement of a door in the room are 2 X 1 m find the total cost of painting the four walls of the room if the cost of painting is a 80 permit square

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Solution

Let length = 15m
Breadth = 9m
Height = 5m

Area of wall excluding door = 155 + 95 + 155 + 95 - 21
= 240-2=238m
Total cost = 80283
=1904 rupees

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The internal dimensions of a room are 15 m x 9 x 5 M the measurement of a door in the room are 2 X 1 m find the total cost of painting the four walls of the room if the cost of painting is a 80 permit square

Let length = 15m Breadth = 9m Height = 5m Area of wall excluding door = 15*5 + 9*5 + 15*5 + 9*5 - 2*1 = 240-2=238m Total cost = 80*283 =1904 rupees

Let length = 15m
Breadth = 9m
Height = 5m

Area of wall excluding door = 155 + 95 + 155 + 95 - 21
= 240-2=238m
Total cost = 80283
=1904 rupees