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51F20 - Geometry :: Metric geometry :: Congruence and orthogonality

angle owned by CWoo angle of view of a line segment owned by pahio betweenness in rays owned by CWoo complementary angles owned by pahio condition of orthogonality owned by pahio congruence axioms owned by CWoo explementary owned by pahio orthogonal owned by akrowne proving Thales' theorem with vectors owned by pahio proving Thales' theorem with vectors owned by pahio supplementary angles owned by pahio vector projection owned by pahio
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