Parallelogram, Theorems and Problems - 5
Triangle and Squares. 21 theorems. Visual illustrations.
Generalizing Van Aubel: Michael de Villiers' Theorems.
Eyeball Theorem: Animated Angle to Geometry Study.
Hippocrates and Squaring the Circle
Triangle with Squares Problem
Thébault's Theorem. Parallelogram with Squares theorem
Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and trisection points of the edges.
Van Aubel's Theorem. Quadrilateral with Squares. Proof with animation.
Ptolemy's Theorem.
Cyclic Quadrilateral: Ratio of the Diagonals
Sangaku Problem. The incenters of four triangles in a cyclic quadrilateral form a rectangle.
Proposed Problem 35. Incenters and Inradii in Cyclic Quadrilateral.
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