Answer :

Given: Length (l) = 3.5m

Breadth (b) = 2.5m

Height (h) = 3m

As we know, the room is in cuboid shape.

So, Area of Four walls = Lateral Surface Area of Cuboid = **2h (l + b)**

= 2 × 3 (3.5 + 2.5)

= 6 (6)

= 36m^{2}

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