Animation 53

Author:
Tim Brzezinski
Topic:
Circle, Circumcircle or Circumscribed Circle, Orthocenter, Special Points

Shown in the applet below are a triangle, its circumcircle, and its 9-point circle. Point O is the triangle's orthocenter. What special theorem about a triangle's 9-Point Circle is being dynamically illustrated below? Note: Be sure to move the BIG GREEN POINT around! Also be sure to move the triangle's gray vertices anywhere you'd like!

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