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A Concurrency Involving the Midpoints of the Sides and the Altitudes
Let ABC be a triangle and let A', B', and C' be the midpoints of the sides opposite A, B, and C. Let A", B'', and C'' be the midpoints of the altitudes from A, B, and C, respectively. Then A'A'', B'B'', and C'C'' are concurrent.



See Midpoints of altitudes and concurrent cevians.


"A Concurrency Involving the Midpoints of the Sides and the Altitudes" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/AConcurrencyInvolvingTheMidpointsOfTheSidesAndTheAltitudes/
Contributed by: Jay Warendorff
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