Antiparallélogramme

The antiparallélogramme is a Quadrilatère of which the pairs on nonadjacent sides are equal length, but where two sides cross and who is thus not a Parallélogramme.

Properties

If the tops has, B, C and D are articulated, the figure varies but the product $\backslash \; overline\; \{constant\; AC\}\; \backslash \; times\; \backslash \; overline\; \{data\; base\}$reste.

• this constant is equal to $L^2\; -\; l^2~$
• demonstration; it is done by considering the power of the point C compared to the circle of center B passing by has, to see Puissance of a point compared to a circle.

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