![]() ![]() \( s \) is the semi perimeter, (half of the sum of all the lengths) and \( \alpha \) and \( \gamma \) are two opposite angles. The formula works for all convex quadrilaterals, which means none of the internal angles are greater than 180°. Then we can use Bretschneider's formula to calculate the area, \( K \). Given 4 lengths and an angle, we can use this information to draw a quadrilateral. ![]() Once diagonal is calculated then it become first scenario to calculate area of irregular quadrilateral with diagonal.Ĭheck out the All in one circle calculator for area and perimeter.
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