Isosceles Triangle, Theorems and Problems - Table of Content 9

Proposed Problem 13. Triangle, cevian, equal segments, and angles.
Auxiliary construction: Isosceles triangle.

Proposed Problem 2. Triangle and angles..
Auxiliary construction: Isosceles triangle.

Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book. Index

Euclid's Elements Book I, Proposition 5: (Pons Asinorum) Isosceles triangles

Isosceles Triangle 80-20-80. Index.

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