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March 26, 2017

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Helping grandson with math. I would like to know how to do it before he does.
"How many different rectangles can be made with a perimeter of 20 units? (Remember, a square is also a rectangle.)"

  • Math - ,

    I assume you mean with integer lengths

    L + w = 10

    L = 5, w = 5 as you said
    L = 6, w = 4
    L = 7, w = 3
    L = 8, w = 2
    L = 9, w = 1

    the ones with w>L do not count because they are indistinguishable from the ones we have now. , So, 5.

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