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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 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.4 metres5 metresNone of these6 metres Q 2: The area of the floor of a hall, which is in the shape of a square is given by 126.563 square metres. If the height is 5 metres, then find the area of the four walls of the hall.225 square metresNone of these215 square metres216 square metres Q 3: 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 metres142.266 quare metres152.266 square metres162.266 square metres Q 4: Find the total area of the four walls of a hall if, its height is 5 metres and one side of the square floor is 17.5 metres.206.25 square metres350 square metresNone of these306 square metres Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!