Geometry: Orthocenter of a triangle, Theorems and Problems - Index 11

Proposed Problem 138. Nagel's Theorem, Orthic Triangle, Altitudes, Circumradius, Perpendicular.

Proposed Problem 137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram.

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.

Proposed Problem 135. Orthic Triangle, Altitudes, Perpendicular, Parallel

Geometry Art 21 - 30.
Right triangle, Altitude, Incircle and inradius, Congruence, Circle.

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