College Geometry Online, eLearning

Isosceles Triangle, Theorems and Problems - Table of Content 10

Isosceles Triangle Index

 

Perpendicular Bisector Index

Perpendicular Bisector.

Triangle with Double Angle

Triangle with Double Angle, Theorems and Problems, Index
 

Langley's Problem Adventitious angles. 20° isosceles triangle with animation.
 

MindMap of Euclid's Elements Book I
Triangles by Side: Equilateral, Isosceles, Scalene. 

Bottema Theorem. Elearning.

Bottema's Theorem.
Invariance of an isosceles right triangle.
Triangle and Squares with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.

Kurschak's Tile and Theorem. Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric way of finding the area of a regular dodecagon.
32 congruent isosceles triangles.

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