Cyclic or Inscribed Quadrilateral with Perpendicular Diagonals  Table of Content




Dynamic Geometry: Brahmagupta Theorem,
. GeoGebra, HTML5 Animation for Tablets 

Geometry Problem 871
Brahmagupta's Theorem, Cyclic Quadrilateral, Perpendicular Diagonals, Midpoint. 

Problem 332.
Cyclic quadrilateral, Ratio of diagonals, Similarity. 

Problem 330.
Cyclic quadrilateral, Perpendicular diagonals, Area, Circumcenter. 

Archimedes' Book of Lemmas: Proposition 9.
Perpendicular chords, sum of arcs.
ACBD is a cyclic quadrilateral with perpendicular diagonals. 

Archimedes' Book of Lemmas: Proposition 11
Perpendicular chords and radius, square.
ACBD is a cyclic quadrilateral with perpendicular diagonals. 