Triangles: Theorems and Problems 34

Interactive Orthopole of a Triangle: Using TracenPoche Dynamic Geometry Software, Online Step-by-Step construction, manipulation, and animation.

Proposed Problem 70: Squares inscribed in a triangle, Similarity.

Morley's Triangle & Center: with interactive animation and manipulation.

Schiffler Point: Four Euler Lines with interactive animation and manipulation.

Proposed Problem 69: Square inscribed in a triangle, Similarity.

Proposed Problem 68: Triangle, Incircle, Inradius, Tangent, Similarity.

Proposed Problem 67: Triangle, Circumcircle, Angles, Cyclic Quadrilateral.
 

Van Aubel's Theorem II: Triangle and Cevians.
 

Proposed Problem 66: Triangle, Excircle, Tangents, Geometric Mean.
 

Feuerbach Points and Nine-Point Circle with interactive animation, manipulation, and step-by-step construction.

Proposed Problem 65: Right Triangle, Mindpoints.

Proposed Problem 64: Triangle, Incircle, Transversal.

Machu Picchu and Sierpinski Triangle. Equilateral

Machu Picchu and Sierpinski Tunel Effect.

Proposed Problem 61: Triangle, Trisection of Sides

Proposed Problem 60: Isosceles triangle and angles.

Taylor Circle Theorem Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation.

Incenter, Excenter, Incircle, Excircle Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation.