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Math Help - Rhombus (vectors)

  1. #16
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by Plato View Post
    Well, we are not mind readers.
    [snip]
    That will be news to many students around the world
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  2. #17
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Plato View Post
    Well, we are not mind readers.
    I am, but I try to make sure people don't know it. It seems to make them nervous that I know all their secrets.

    -Dan
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  3. #18
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    Quote Originally Posted by topsquark View Post
    I am, but I try to make sure people don't know it. It seems to make them nervous that I know all their secrets.

    -Dan
    Oho. Then you know what I'm thinking after having read this.

    (Wow, you really can read minds! )
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  4. #19
    Senior Member JaneBennet's Avatar
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    Quote Originally Posted by Mtl View Post
    Ok, I'm still confused here... Wouldn't the diagonals' magnitude have to be equal in a rhombus?
    If the rhombus has sides of length a and \theta is one of its interior angles, the diagonals have lengths 2a\cos{\frac{\theta}{2}} and 2a\sin{\frac{\theta}{2}}. The two are equal if and only if \theta=\frac{\pi}{2}.
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