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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. –  Beni Bogosel Dec 2 '11 at 21:01
    
ok. thank you. do you know what am arbitrary quadrilateral exactly is? –  tyler w Dec 2 '11 at 21:04
    
@tylerw - it means any quadrilateral –  Victor Dec 2 '11 at 21:07
    
oh. ok. thank you. –  tyler w Dec 2 '11 at 21:09
    
It is as opposed to special quadrilaterals, like squares, rectangles, rhombuses, parallelograms, and trapezoids. There may be more to be opposed to. –  Ross Millikan Dec 3 '11 at 5:49
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1 Answer 1

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 away –  tyler w Dec 2 '11 at 20:58
    
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. –  J. M. Dec 3 '11 at 1:30
    
@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 <math>…</math> with $…$, though. –  Kevin Reid Dec 3 '11 at 18:36
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