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This is the question:

Find the area of the rhombus $PQRS$ if the coordinates of point $P$, $Q$ and $R$ are $(6, 4)$, $(8, 7)$ & $(-6, 3)$ respectively.

Does any one know how to solve this?

Thanks!!

  • 2
    I don't think this is a rhombus - which has all 4 sides equal length...2011-06-06
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    Compare http://math.stackexchange.com/q/424165/139123 -- if you knew all 4 vertices, a good first step in finding the area would be to _forget_ one of them. So if you know only 3 vertices then you are already a step ahead.2015-07-01

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