Triangle with Double Angle, Theorems and
Adventitious angles. 20° isosceles triangle with animation.
MindMap of Euclid's Elements Book I
Triangles by Side: Equilateral, Isosceles, Scalene.
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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