Move the points in the grafic or define the point coordinates in the numeric field.
The opposite sides are equal. The opposite sides are parallel. The diagonals halve each other. All angles have 90°.
With the side length a = AB = CD and b = BC = DA is the circumference:
With the side length a and b is the area:
With the side length a and b is the diagonal length given by:
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Here is a list of of further useful sites:Index Trigonometric calculations Circle Ellipse Parallelogram Triangle