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The perimeter of a floor of a room is 18m.What is the area of four walls of the room if it; a height is 3m?

Correct answer: C. 54 Sq.m

  • A. 21 Sq.m
  • B. 42 Sq.m
  • C. 54 Sq.m
  • D. 108 Sq.m

Explanation

The area of the four walls of a rectangular room equals its floor perimeter multiplied by height. Hence the area is 18 metres × 3 metres = 54 square metres. Students may choose 108 square metres by multiplying by 2 again, even though the given perimeter already includes all four sides.

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Area measures the surface enclosed by two-dimensional figures, while volume measures the space occupied by three-dimensional solids. Problems use formulas for rectangles, triangles, circles, prisms, cylinders, cones, spheres, and composite figures, including unit conversion and the distinction between surface area, lateral area, and volume.

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