Reflections of a Point in the Midpoints of a Triangle's Sides
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Let ABC be a triangle and P be an arbitrary point. Let A', B', and C' be symmetric to P with respect to the midpoints BC, CA, and AB, respectively. Then A'B'C' is congruent to ABC and their corresponding sides are parallel.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
See problem 5.43 in V. Prasolov, Problems in Plane and Solid Geometry, Vol. 1, Plane Geometry [PDF], (D. Leites, ed. and trans.).