Triangles (Page 3 of 6)

Sawayama -Thebault's theorem

Proposed Problem 34.

Proposed Problem 33.
Triangle and quadrilateral.

Interactive Mind Map of the Van Hiele Model of Geometric Thought

Problem 32.
Triangle, Cevian, Incircles, Tangents.

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

Ptolemy's Theorem.

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

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

Triangle and Squares.

Fifteen theorems.

42 Proposed Problems

Proposed Problems

Key Theorems

Equal Incircles Theorem

Menelaus' Theorem

Ceva's Theorem

Equilic Quadrilateral