Apparently, this user prefers to keep an air of mystery about them.
2 How do I prove that the triangle must be obtuse? May 9 '13
0 Prove that X can't possibly be a point on side BC that coincides with the midpoint or the other point of intersection of the nine-point circle. May 9 '13
0 Prove triangles with same perimeter and point of tangency of excircle and nine-point circle. May 9 '13