Geometry, Theorems and Problems, Methodologies, Definitions, Software

Triangle and Squares.

Quadrilaterals.

Parallelograms Index.

Square.

Rectangle.

Rhombus.

Trapezoids.

Median of a Trapezoid, Theorems and Problems. Index.

Cyclic Quadrilateral.

Ptolemy's Theorems and Problems - Index.

Brahmagupta Theorem and Problems - Index Brahmagupta (598–668) was an Indian mathematician and astronomer who discovered a neat formula for the area of a cyclic quadrilateral.

Tangential or Circumscribed Quadrilateral

Equilic Quadrilateral.

Complete Quadrilateral Index.

Polygons.

Pentagons.

Hexagons.

Heptagons.

Octagons.

Nonagon or Enneagon.

Decagon. Theorems and Problems

Circles.

Triangle Centers.

Congruence. Index.

Similarity, Ratios, Proportions. Index.

Areas Index.

Geometria en Espanol, Teoremas y Problemas en Espanol. (Spanish-language version)

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