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Without using a graphing calculator the possible answer is:

length = 40 metres and width = 20 metres because:

Area = 40*20 = 800 square metres

Perimeter = 40+40+20+20 = 120 metres

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Q: If the perimeter of a rectangle is 120 meters and the area is 800 meters squared how do you find length and width using a graphing calculator?
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