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In a triangle ABC with circumcircle O and orthocenter H, M is the midpoint of AC. MH extended meets the arc BC at D. Prove that the measure of angle BDM is 90 degrees.

Home | Search | Geometry | Problems | All Problems | Open Problems | Visual Index | 10 Problems | 1131-1140 | Triangle | Circle | Orthocenter | Circumcircle | 90 degrees | Midpoint | Email | Solution / comment.Last updated: Jul 15, 2015 by Antonio Gutierrez.