Q13 of 24 Page 236

A rectangular room is a 6m long, 4.8m wide and 3.5m high. Find the inner surface area of the four walls.

Given,


length (l) = 6 m


width (w) = 4.8 m


height (h) = 3.5 m


Total area of walls = 2(wh) + 2(lh)


= 2h (l+w)


= 2 × 3.5 (4.8 + 6)


= 75.6 m2


So, the inner surface area of walls is 75.6 m2


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