Q3 of 20 Page 219

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(l) = 12m

Breath(b) = 10m


Height(h) = 7.5m


We know, in case of area of four wall which is formed a cuboid, eliminate the area of base and top i.e. (l × b) Hence,


Area of four walls = 2(bh + lh)


= 2((10 × 7.5) + (12 × 7.5))


= 2(165)


= 330m2


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