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  • 02:34, 2 August 2014 (diff | hist) . . (+14). . Angle(I have clarified the meaning of "or", between (A) 'equivalence' (Eg cats or felines) & (B) 'alternative' (Eg cats or dogs). As rays are infinite in length, and line segments are finite, I have opted for the B meaning.)
  • 23:55, 28 July 2014 (diff | hist) . . (-4). . Concurrent lines(Triangles: Replace "three" with "4". "In a triangle, 4 basic types of sets of concurrent lines are Altitude (triangle), angle bisectors, medians, and perpendicular bisectors:")