Online Geometry

Online Geometry: Triangle Centers, Theorems and Problems Index, Page 5

Triangle Centers - Table of Content 5

The School of Athens

Geometric Art of Triangle Centers, Visual Summary, Delaunay Triangulation, Circular Random Composition, iPad Apps

Geometric art of triangle centers visual summary
Delaunay Triangulation, Circular Random Composition, iPad Apps.

Problem 32.
Triangle, Cevian, Incircles, Tangents.

Problem 31. Right Triangle, Incircle, Collinears.
Problem 30. Right Triangle, Incircle, Inradius.

Proposed Problem 29.
Right Triangle, altitude, incircle and inradius. Ten conclusions.

Problem 29: Geometry Help.
Facts you should know.

Heron's Formula with medians 

Proposed Problem 28
Right Triangle, altitude, incircles and inradius.

Proposed Problem 27
Right Triangle, incircles and inradius.

Proposed Problem 26
Right Triangle, altitude, incircles and inradius.

Proposed Problem 25
Right Triangle, altitude, incircles and inradius.

Proposed Problem 24
Right Triangle, altitude, incircles and inradii.

Proposed Problem 23
Right Triangle, altitude, incircles and inradii.

Proposed Problem 22
Right Triangle, altitudes, incircles and inradii.

Proposed problem 21
Acute triangle, orthocenter, diameter, tangents.

Proposed problem 20
Right Triangle, incircles and inradii.

Proposed problem 19
Right Triangle and Excenter

Heron's Formula.
Key facts and
a purely geometric step-by-step proof.
 

Napoleon's Theorem

Napoleon's Theorem. A purely geometric proof. It uses the Fermat point to prove Napoleon without transformations.
 

The Bevan Point: Puzzle

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