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Math Help - [SOLVED] I desperately need help

  1. #1
    CSP
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    [SOLVED] I desperately need help

    I have a math exam in 2 days. i havent done the course, but my friend has tutored me , and i seem to know enough of the cirriculum to move on to the program i want next year. However, I do not know how to find the radius of a triangle. Can anyone help me ?
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  2. #2
    MHF Contributor
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    I'm sorry to say I'm not familiar with the radius of a triangle. I even looked it up on Wikipedia to make sure I'm not confusing syntax. Can you give an example of what you mean?

    http://en.wikipedia.org/wiki/Triangle
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  3. #3
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    Quote Originally Posted by CSP
    I have a math exam in 2 days. i havent done the course, but my friend has tutored me , and i seem to know enough of the cirriculum to move on to the program i want next year. However, I do not know how to find the radius of a triangle. Can anyone help me ?
    I do not know what "radius of triangle" means.
    However, I belive I might know what you are referring to.

    Radius of Inscribed circle in Triangle" In that case we have that,
    r=\frac{A}{S} where A is area and S is semiperimeter. (Note to find area of triangle you might need to used some other theorems).

    Radius of Circumscribed circle around triangle: In that case use the extended law of sines:
    2R=\frac{a}{\sin \alpha}=\frac{b}{\sin \beta}=\frac{c}{\sin \gamma}. (Note to find the angle of the triangle you might need to use the law of cosines to solve for angle).
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