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### Grade 7 - Mathematics9.42 Area of the Four Walls of a Room - II

 Example: The perimeter of the floor is 115 metres and the height of the room is 16 metres, find the area of the room and find the cost of painting the four walls at the rate of \$620 for 100 square metres. Solution: Given that, Perimeter of the floor = 115 metres. Height = 16 metres. Therefore, total area of the four walls A = ph. ie A = 115 * 16 = 1840 Square metres. Therefore, total area of the four walls is 1840 square metres. Cost of the painting the four walls = \$ (620 * 1840) / 100 = \$ 11,408. Directions: Read the above example carefully and answer the following questions: If the perimeter of a floor is 12x units and the height of the room is x units, find the area of the floor. Also find the area when x = 5 metres. (Answer: 12x2; 60 square metres)
 Q 1: The height of a room is 15 metres. Find the perimeter of the floor, if the area of the room is given by 2970 square metres.198 metres1350 metresNone of these2630 metres Q 2: The perimeter of the floor is 177 metres. Find the height of the room, if the area of the room is given by 1947 square metres.16 metres11 metres56 metres29 metres Q 3: The perimeter of the floor is 120 metres and the height of the room is 7 metres, find the area of the room. 740 square metres840 square metres540 square metres640 square metres Q 4: The perimeter of the floor is 180 metres and the height of the room is 13 metres. Find the cost of painting the four walls at the rate of \$ 550/100 square metres.\$ 12,754\$ 10,546\$ 12,870\$ 2340 Q 5: The perimeter of the floor is 134 metres and the height of the room is 16 metres, find the area of the room.1144 square metres3144 square metresNone of these2144 square metres Q 6: The perimeter of the floor is 160 metres. Find the height of the room, if the area of the room is given by 1920 square metres.12 metresNone of these17 metres29 meters Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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