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| Area of a convex quadrilateral. Example of creating a calculator. This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator. |
| Area of a quadrilateral This article lists several calculators to compute the area of a quadrilateral |
| Area of a rectangle by coordinates This online calculator calculates area of a convex quadrilateral (rectangles too) given coordinates of four vertices (corners) |