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### Grade 7 - Mathematics9.43 Area of the Four Walls of a Room - III

 Example: The total area of the four walls of a hall is 216 square metres. Its height is 8 metres. If the floor of the hall is in the shape of square, find the area of the floor. Solution: Given that, Total area of the four walls (A) = 216 square metres. Height (h) = 8 metres. Equation for the above problem A = 4lh Now l = A/4h l = 216/(4*8) = 6.75 metres Each side of the floor = 6.75 metres. Therefore, area of the floor = 6.75 * 6.75 = 45.5625 square metres. Directions: Read the above example carefully and answer the following questions: The total area of the four walls of a hall is 28x sq units. Its height is x units. If the floor of the hall is in the shape of a square, find the area of the floor. (Answer:- 49 square metres)
 Q 1: The total area of the four walls of a hall is 346 square metres. Its height is 6 metres. If the floor of the hall is in the shape of square, find the area of the floor.402.063 square metresNone of these203.063 square metres303.062 square metres Q 2: The total area of the four walls of a hall is 420 square metres. Its height is 8 metres. If the floor of the hall is in the shape of square, find the area of the floor.172.266 square metres152.266 square metres142.266 quare metres162.266 square metres Q 3: The total area of the four walls of a hall is 516 square metres. Its height is 6 metres. If the floor of the hall is in the shape of square, find the area of the floor.462 square metres462.25 square metres450 square metres452.25 square metres Q 4: The total area of the four walls of a hall is 256 square metres. The floor of the hall is in the shape of square. Find the height, if area of the floor is also equal to 256 square metres.6 metresNone of these4 metres5 metres Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!