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16 October, 00:51

The hypotenuse of a right triangle is 13.0, and one leg is 9.0 units shorter than the other. Find the dimensions of the figure (rounded to the nearest tenth)

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  1. 16 October, 03:52
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    Let, one leg be x units.

    since the other leg is 9.0 units shorter than the other,

    the measure of the other leg = x-9

    hypotenuse = 13.0 units

    According to Pythagorean theorem, the square of the hypotenuse is equal to the sum of squares of the other two sides.

    x^2 + (x-9) ^2 = 13^2

    x^2 + x^2 - 18x + 81 = 169

    2x^2-18x-88=0

    Divide the whole equation by 2

    x^2 - 9x - 44 = 0

    Let's use the quadratic formula to find the roots.

    formula: x = [-b ± sqrt (b^2-4*a*c) ]/2*a

    a=1 b=-9 c=-44

    x = [9±sqrt (81+176) ]/2

    =[9±sqrt (257) ]/2

    =[9±16.03]/2

    =25.03/2 or - 7.03/2

    length of a triangle cannot be negative,

    Therefore, x=25.03/2 = 12.52

    one leg = 12.5 units

    other leg = 12.52-9 = 3.5 units
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