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Users of Planetcalc are persistently asking us to create a calculator for area of irregular quadrangle for which the only lengths of the sides are known. So, I've decided to make this joke calculator(Press "pause" button to calculate the area of a quadrangle with given sides which you liked most.
Area of an irregular quadrangle cannot be calculated with the sides length only. I hope this demonstration will help those who asked about the calculator to understand this.