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Online Geometry Problem 670: Triangle, 60 Degrees, Orthocenter, Incenter, Circumcenter, Congruence. Level: High School, Honors Geometry, College, Mathematics Education

The figure shows a triangle ABC with angle B = 60 degrees, orthocenter H, incenter I, and circumcenter O. Prove that HI and IO are congruent.
 

Trangle with 60 degrees, Orthocenter, Incenter, Circumcenter
 

Home | SearchGeometry | Problems | All Problems | Open Problems | Visual Index | 661-670 | Triangles | Incenter | Orthocenter | Circumcenter | Angles: 30, 60, 120 degrees | Email | Post a comment or solution | By Antonio Gutierrez