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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