![]() This quadrilateral has no two sides or angles the same We will use this fact to double check the answer we get using the general formula for the area of a quadrilateral. The quadrilateral has no two sides or angles that are the same, but like all convex quadrilaterals it can be broken down into two triangular shapes using one of the diagonals. In order to test the formula, we will use irregular convex quadrilateral ABCD (shown below). half of the perimeter of the quadrilateral, otherwise known as the semi-perimeter):
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