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what is an arbitrary quadrilateral?

I can't find a definition of it anywhere. How would you find the area of an arbitrary quadrilateral?

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    A 'definition' is different than a 'formula'. As for formulas, there are some, including the one given in the answer. One other approach would be to consider two triangles and calculate their areas, or consider the formula $S=d_1 \cdot d_2\cdot \sin \theta /2$ where $d_i$ are the length of the diagonals and $\theta$ is the angle between them.2011-12-02
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    ok. thank you. do you know what am arbitrary quadrilateral exactly is?2011-12-02
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    @tylerw - it means any quadrilateral2011-12-02
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    It is as opposed to special quadrilaterals, like squares, rectangles, rhombuses, parallelograms, and trapezoids. There may be more to be opposed to.2011-12-03
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    thank you. i understand it better now.2011-12-04

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Please see here.

It is too complicated, I would rather to provide the link instead of copying it.

If you know all the coordinate of the quadrilateral, then use this.

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    ok, thanks. i will look at that link right away2011-12-02
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    It's a bit easy to copy formulae from Wikipedia. Right-click on the image, choose "properties", and in the alt-text, the $\LaTeX$ code is often shown. You can copy that and paste here for MathJax to parse.2011-12-03
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    @J.M. Many browsers (e.g. Safari and Chrome) do not have that feature. One can “Edit” the page on Wikipedia and copie the $\LaTeX$ from there (replacing `` with `$…$`, though.2011-12-03