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Math Help - [SOLVED] Area of a Triangle?

  1. #1
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    [SOLVED] Area of a Triangle?

    In the xy-plane, what is the area of a triangle whose vertices are ,
    , and ?
    (A) 3.59 (B) 5.67 (C) 7.91 (D) 11.18 (E) 11.34
    Attached Thumbnails Attached Thumbnails [SOLVED] Area of a Triangle?-prac2_2fig.gif  
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  2. #2
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    A = \frac{1}{2}bh = \frac{1}{2}(5 - \sqrt{2})(\sqrt{10})
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  3. #3
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    Quote Originally Posted by skeeter View Post
    A = \frac{1}{2}bh = \frac{1}{2}(5 - \sqrt{2})(\sqrt{10})

    how did you get b as 5-sqrt2?

    Thanks again!!
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  4. #4
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    the points on the x-axis are (5,0) and (\sqrt{2},0)

    the distance between those two values is 5 - \sqrt{2}
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