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11 September, 10:37

John is trying to determine the length of the staircase he will need for a deck that is 12 feet high he wants to start the stairs 21 feet from the deck

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  1. 11 September, 12:32
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    Right triangle

    legs are 21 and 12

    a^2+b^2=c^2

    12^2+21^2=c^2

    144+441=c^2

    585=c^2

    sqrt both sides

    5√65=c

    aprox

    24.1868=c

    about 24.2 feet
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