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problem no.16
Author:
keith cayabyab
The diagonals of a quadrilateral ABCD intersect at E; prove that the center of the circle circumscribed about the triangles AEB,BEC,CED,DEA,are the vertices of a parallelogram.
GeoGebra
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探究由平行線和截線所成的角
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اتقان عمليات الجمع والطرح والضرب
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