Geometry: Orthocenter of a triangle, Theorems and Problems - Index 10

Proposed Problem 191. Triangle, Altitudes, Orthocenter, Squares, Areas.

Proposed Problem 139. Triangle Area, Orthic Triangle, Semiperimeter, Circumradius.

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

Geometry Art 41 - 50.
Triangle, Sangaku, Quadrilateral, Circle, 30-60 Degrees.

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