The total area of the walls is 140 m²
Since the room is in the shape of a cuboid, and we require the area of the walls of the room, the walls of the cuboid are the walls of the room.
So, the total surface area of a cuboid is A = 2(lb + lh + bh) where
Since we require the total area of the walls, lb which is the area of the floor is removed from the equation.
So, the area of the walls is A' = 2(lh + bh)
= 2h(l + b)
Since the dimensions of the floor are 4 meters by 6 meters and the height of the basement is 7 m. So,
So, substituting the values of the variables into the equation, we have
A' = 2h(l + b)
A' = 2 × 7 m × (4 m + 6 m)
A' = 14 m × 10 m
A' = 140 m²
So, the total area of the walls is 140 m²
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