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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:

$U=2a+2b$

With the side length a and b is the area:

$F=a*b$

With the side length a and b is the diagonal length given by:

$d=\sqrt{{a}^{2}+{b}^{2}}$

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Here is a list of of further useful sites:

Index Trigonometric calculations Circle Ellipse Parallelogram Triangle