**Online calculator: Area of a rectangle by coordinates**
https://planetcalc.com/8580/

Feb 07, 2020 · The online calculator below calculates the area of a rectangle, given coordinates of its vertices. In fact, the calculation is quite generic, so it can also calculate the area of parallelogram, square, rhombus, trapezoid, kite, etc., that is, the area of any convex quadrilateral. Enter the set of points into the calculator below - one point per line, with x and y coordinates separated by a semicolon.

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