Online Geometry: Triangles, Theorems and Problems

Online Geometry

Triangles Theorems and Problems- Page 29

Triangles

Elearning Geometry

Triangle, Medians, Six Circumcenters Concyclic. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Trapezoid

Trapezoid, Triangle, Diagonals, Midpoints. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Interactive Geometry

Triangle: Incircle, Perpendicular, Angle Bisector. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Problem 133

Proposed Problem 133. Triangle, Angle Bisectors, Collinear Points.

Elearning 132

Proposed Problem 132.
Triangle, 60 degree, Orthocenter, Congruence, Midpoint.

 

Triangle with the bisectors of the exterior angles

Triangle with the bisectors of the exterior angles. Collinearity. Key concept: Menelaus Theorem.
 

Elearning 131: Van Aubel, Concurrent Cevians

Proposed Problem 131. Van Aubel Theorem, Concurrent Cevians, Sum of Ratios.

Elearning 130: Concurrent Cevians

Proposed Problem 130. Triangle, Concurrent Cevians, Sum of Ratios.

Elearning 129: Concurrent ceviasn, ratios

Proposed Problem 129. Triangle, Concurrent Cevians, Sum of Ratios.

Elearn 128: Incenter, Ratios

Proposed Problem 128. Incenter of a Triangle, Angle Bisectors, Sum of Ratios.

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