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9 December, 14:30

The perimeter of a rectangle is 42 cm. One side is 9 cm longer than the other side. Find the lengths of the sides.

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  1. 9 December, 14:46
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    P=2 (L+W)

    P=42

    42=2 (L+W)

    21=L+W

    one side is 9 longer than other

    L=9+W

    subsitute

    21=L+W

    21=9+W+W

    21=9+2W

    minus 9 both sides

    12=2W

    divide by 2 both sides

    6=W

    sub back

    L=9+W

    L=9+6

    L=15

    the sides are lenght 15cm and 6cm
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