You mean the largest possible area with a perimeter of 18, right?
Well, the largest area is with a circle, which has area 81/pi which is approximately 25.7831
If you need a rectangular area, the largest is a square of width=length (definition of square) = 4.5
This has area 4.52 which is 20.25, substantially less than the circles area...
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Yes.
Yes
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The answer will depend on what those numbers represent and their units. It is possible that the question gives 18 and 5 units as the length and width of a rectangle and requires you to find the area and perimeter. Or It is possible that the question has given 18 in some units and 5 in some other units and requires you to determine which one could be the area and which the perimeter.