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Ah, what a lovely question! To find the perimeter of a room, you simply add up all the sides. In this case, for a room that is 5 meters by 4 meters, you add 5 + 5 + 4 + 4 to get a perimeter of 18 meters. Just imagine walking around the room, taking in all the beauty it holds!
4m+9+5m-12=42 9m=45 m=5
4m + 9 + 5m - 5 = 42 9m + 4 = 42 9m = 38 m = 38/9
M = 5 * * * * * 4m + m - 11 = 9 or 5m - 11 = 9 so that 5m = 20 and then m = 4, NOT 5.
The perimeter of 4 meters by 5 meters is 18. Is the figure a square? if it is then the answer is 18m squared. The first answer is correct if the shape is a parallelogram; the second is rubbish. A square cannot be 4m by 5 m because one of the defining characteristics of a square is that its sides are the same length! The perimeter is the length (therefore metres, NOT m sq) around the shape. 4m+5m+4m+5m = 18m.
4m + 9 + 5m - 12 = 42 9m -3 = 42 9m = 42 + 3 9m = 45 m = 5