Triangles: Theorems and Problems 29
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Elearning Geometry](../geometry/triangle_median_circ_17.jpg) |
Triangle, Medians, Six Circumcenters Concyclic.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition. |
![Trapezoid](../geometry/trapezoid_diagonal_01_17.jpg) |
Trapezoid, Triangle, Diagonals, Midpoints.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition. |
![Interactive Geometry](../geometry/triangle_incircle_perpendic.jpg) |
Triangle: Incircle, Perpendicular, Angle Bisector.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition. |
![Problem 133](../problem/p133_angle_bisector_17.jpg) |
Proposed Problem
133. Triangle, Angle Bisectors,
Collinear Points.
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![Elearning 132](../problem/p132_triangle_orthocenter.jpg) |
Proposed Problem
132.
Triangle, 60 degree, Orthocenter, Congruence, Midpoint.
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![Triangle with the bisectors of the exterior angles](../triangleBisect170x100.jpg) |
Triangle with the bisectors of the
exterior angles. Collinearity. Key concept:
Menelaus Theorem.
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![Elearning 131: Van Aubel, Concurrent Cevians](../problem/p131_van_aubel_cevian_ratio.jpg) |
Proposed Problem
131. Van Aubel Theorem, Concurrent Cevians, Sum of Ratios.
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![Elearning 130: Concurrent Cevians](../problem/p130_cevian_ratio_elearn_17.jpg) |
Proposed Problem
130. Triangle, Concurrent Cevians, Sum of Ratios.
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![Elearning 129: Concurrent ceviasn, ratios](../problem/p129_cevian_ratio_elearn_17.jpg) |
Proposed Problem
129. Triangle, Concurrent Cevians, Sum of Ratios.
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![Elearn 128: Incenter, Ratios](../problem/p128_incenter_bisector_17.jpg) |
Proposed Problem
128. Incenter of a Triangle, Angle Bisectors, Sum of Ratios.
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