Geometry: Orthocenter of a triangle, Theorems and Problems - Index 12

Proposed Problem 134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter.

Proposed Problem 132. Triangle, 60 degree, Orthocenter, Congruence, Midpoint.

Proposed Problem 79: Triangle. Similarity, Altitudes, Orthocenter, Incircles, Inradii.

Problem 37. Right triangle, altitude, incircles, incenters, and orthocenter.

Problem 21. Acute triangle, orthocenter, diameter, tangents.

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