the greatest area is when the rectangle is a square. That would mean each side is 20/4 = 5m
The maximum area is 5^2 = 25 m^2
Multiply any two other two numbers that add up to 10 and you will get less than 25.
Sarah has 20 m of garden edging. What are the dimensions of the rectangular garden with the greatest area can she enclose with the edging? What is the maximum area?
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