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There are a number of different formulae that can be used for irregular quadrilaterals, depending on the information given. Usually, the method to find the area involves cutting the shape into two triangles, then finding the area of the triangles individually using whatever formula applies.

If you have the lengths of every side (a,b,c,d) and the length of one diagonal (let's say the one going from the corner ab to the corner cd, call it e) then you can use heron's formula twice to get the overall area:

Area = (SQRT(x(x-a)(x-d)(x-e))) + (SQRT(y(y-b)(y-c)(y-e)))

Where x=(a+d+e)/2 and y=(b+c+e)/2

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Q: What is the formula to find area of irregular quadrilateral?
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