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13 October, 12:58

What are the dimensions of a right triangle with a ten-inch hypotenuse and an area of 25 square inches? (enter the lengths of the sides as a comma-separated list.) ?

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  1. 13 October, 13:07
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    Let the legs of the triangle be x and y

    using Pythagorean theorem:

    c²=a²+b²

    the hypotenuse will be:

    x²+y²=10²

    x²+y²=100

    x²=100-y² ... i

    the area of the triangle is:

    A=1/2bh

    A=1/2xy

    ⇒25=1/2xy

    50=xy

    x=50/y

    x²=2500/y² ... ii

    substituting ii in i and solving for y we get:

    2500/y²=100-y²

    2500=100y²-y^4

    this can be written as:

    y^4-100y^2+2500=0

    thus

    y=5√2

    x=50 / (5√2) = 5√2

    thus:

    Answer: (5√2,5√2)
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