![](../landscape/landscape_px1.gif) |
|
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](p670_triangle_60_degrees.gif)
|
|
|
|
|
|
![](../landscape/landscape_bg_right.gif) |
![](../landscape/landscape_px1.gif) |