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Math Help - Area of a triangle formed by P, Q, and R

  1. #1
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    Area of a triangle formed by P, Q, and R

    hello everyone.

    First off, I'd like to say that this is a wonderful site, and I appreciate the help.

    Now, onto the question.

    I have a plane formed by P(2,0,-3) Q(3,1,0) and R(5,2,2)

    I first had to find a vector orthogonal to the plane. I did that by forming 2 vectors using PQ and PR, then getting the cross product.

    Now it is asking that I find the area of the triangle that is formed by P, Q, and R. I know there is a formula that I am missing, and it is not in the text book that I can find. I missed that day in class, and now I'm feeling the consequences.

    Thank you guys.
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  2. #2
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    The area of the triangle PQR is one-half ||<PQ>x<PR>||.
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  3. #3
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    thank you
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