alleryA room is 10 m long, 8 m wide and 3 m high. What is the total area of its four walls?
A240 m²
B108 m²
C216 m²
D144 m²
Answer & Solution
Correct answer: B. 108 m²
Four walls have area 2(l + b)h = 2 x 18 x 3 = 108 square metres.
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