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  1. The perimeter of the floor of a room is 18 m. What is the area of the walls of the room, if the height of the room is 3 m ?
    1. 21 m²
    2. 42 m²
    3. 54 m²
    4. 108 m²
Correct Option: C

Area of four walls of a room = 2(length + breadth) × height
= Perimeter of floor × height = 18 × 3 = 54 m²


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