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If it is a cyclic quadrilateral, meaning that it can be inscribed in a circle, then you can use the formula

where S is the semiperimeter (half the sum of all the sides) and a, b, c, and d are all side lengths. If it is not a cyclic quadrilateral or you are unsure if it is or not then use the formula:

where S is the semiperimeter (half the sum of all the sides) and a, b, c, and d are all side lengths and A and B are the angle measures across from side lengths a and b.

hope this helps

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Q: Area formula quadrilateral
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