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Show that the largest rectangle with a perimeter of $20$ meters is a square.

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    What have you tried so far? To be able to help you better, we need to see your work.2012-06-10
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    Welcome to the site. For future reference, it's considered good form here not to pose questions as imperatives. Keeping in mind @Ayman's response, you might get better answers if you had said something like, "How can I show that the maximum-area rectangle with perimeter 20 is a square? I've tried but am stuck." You have two good answers already, so you might want to accept one (by clicking on the check mark icon below an answer).2012-06-11

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