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							 Geometry Problems 841-850: Triangle, Median, Centroid, Circumcenter, Congruence, Similarity, Parallel, Perpendicular, Quadrilateral, Special Right Triangle. 
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		Geometry Problem 841Triangle, Medians, Centroid, Circumcenters, Perpendicular, Congruence, Similarity.
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		Geometry Problem 842Triangle, Medians, Centroid, Four Circumcenters, Perpendicular,�Congruence, Similarity.
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		Geometry Problem 843Triangle, Medians, Centroid, Four Circumcenters, Perpendicular,�Parallel, Congruence, Similarity.
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		Geometry Problem 844Triangle, Medians, Centroid, Four Circumcenters, Perpendicular,�Congruence, Similarity.
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		Geometry Problem 845Triangle, Medians, Centroid, Four Circumcenters, Perpendicular,�Congruence, Similarity.
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		Geometry Problem 846Triangle, Medians, Centroid, Four Circumcenters, Concyclic Points, Cyclic Quadrilateral, Similarity.
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		Geometry Problem 847van Lamoen Circle, Triangle, Medians, Centroid, Six Circumcenters, Concyclic Points.
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		Geometry Problem 848Special Right triangle, Catheti or legs ratio 1:2, 26.5 Degrees. Double angle.
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		Geometry Problem 849Special Right triangle, Catheti or legs ratio 1:3, 18.5 Degrees. Double angle.
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		Geometry Problem 850Triangle, Double side, Angles, 90 Degrees, Special Right triangle.
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