encloses more area.
10. A door of length 2 m and breadth 1.5 m is on a wall.
The length of the wall is 4.5 m and breads
is 3.6 m. Find the cost of white-washing the wall at the rate of 20 per m².
11. A school room is 12 m long, 8 m wide and 5 m high. Find the area of its four walls.
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