math

The length of a rectangle is twice its breadth. If the perimeter is 42cm, find:

1) the length

2) the breath

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  1. P = 2L + 2W

    42 = 2(2W) + 2W

    42 = 6W

    7 = W

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    Ms. Sue
  2. Let the breadth of rectangle be xm
    Length _ 2xm
    Perimeter_2 (length + breadth)
    Perimeter_ 2 (x+2x)
    _ 6x _42m
    _3x _21m
    On solving we get
    x_7m
    Breadth_ 7m
    Length_ 14m
    Area _ length x breadth
    _ 14 x 7
    Area_ 98 m²

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  3. bakwas

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  4. first one good

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