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Standard IX

Mathematics

Total Surface Area of a Cuboid

Find the area...

Question

Find the area of four walls of a room (Assume that there are no doors or windows) if its length 12 m, breadth 10 m, and height 7.5 m.

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Solution

Given length 12 m, breadth 10 m, and height 7.5 m

Then the area of four walls = $2 (l h + b h)$

$= 2 (12 \times 7.5 + 10 \times 7.5)$

$= 2 (90 + 75) = 330 m^{2}$

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Find the area of four walls of a room (Assume that there are no doors or windows) if its length 12 m, breadth 10 m, and height 7.5 m.

Given length 12 m, breadth 10 m, and height 7.5 mThen the area of four walls =2(lh+bh)=2(12×7.5+10×7.5)=2(90+75)=330m2

Given length 12 m, breadth 10 m, and height 7.5 m

Then the area of four walls = $2 (l h + b h)$

$= 2 (12 \times 7.5 + 10 \times 7.5)$

$= 2 (90 + 75) = 330 m^{2}$