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