[alogo] Symmetries on vertices

Given a parallelogram ABCD and a point E, construct F, symmetric to E w.r. to A, G symmetric to F w.r. to B etc. The resulting polygon EFGH closes i.e. the symmetric of H w.r. to D is again E.

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This leads to a way to construct all quadrangles with given diameters in length and directions. Here the parallelogram (ABCD) and point E are movable (through the selection-tool (CTRL+1)).
The same subject, for general quadrangles, is handled in the file: SymmetriesOnVerticesEven.html .

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