Calculate the area of a quadrilateral from the the lengths of the four sides and the sum of opposite angles using the formula.

Enter the lengths a, b, c, and d of the four sides and the sum of diagonals A+B, and click the "Calculate Area of Quadrilateral" button. Calculates and displays the area of a rectangle from the length of four sides and the sum of opposite angles.

### Area of quadrilateral with side a in 3, side b in 4, side c in 5, side d in 6, sum of opposite angles A+B in 180

Area S: 18.97366596101