![]() Can somebody give an elementary proof using Euclidean geometry? Also, I noticed that in my proof, nowhere did I use the fact that $ABCD$ is a parallelogram, but constructing an example, it was quickly clear that the result stated does not generalize to all quadrilaterals. name of a parallelogram much more than this term means in the classical. As $OAEB, OBFC, OCGD, ODHA$ are parallelograms, it Cabri, Sketchpad or Geogebra, are likely to engender specific discourses. We can obtain a fairly trivial proof using affine geometry. Try to discover which lengths are congruent, parallel, perpendicular, or bisected. GeoGebra Classic was added to AlternativeTo by braky on and this page was last updated May 20, 2020. ![]() ![]() Parallelograms $OAEB, OBFC, OCGD, ODHA$ are completed. This investigation is about discovering the relationships sides, angles, and the diagonals of the parallelogram. In the following figure, $ABCD$ is a parallelogram, and $O$ is any point.
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