Online Geometry: Cyclic Quadrilateral Theorems
and Problems Table of Content 5




Proposed Problem 215.
Quadrilateral, Angle Bisectors, and Cyclic
Quadrilateral.


Cyclic quadrilateral
Proposed Problem 78: Angles of a Circle.
Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic
quadrilateral, Congruence.


Cyclic quadrilateral
Proposed Problem 77: Angles of a Circle.
Parallel lines, Cyclic quadrilateral.


Proposed Problem 74: Three Intersecting Circles.
Cyclic quadrilateral, Angles.


Proposed Problem 73: Three Intersecting Circles.
Cyclic quadrilateral.


Proposed Problem 72: Intersecting Circles.
Cyclic quadrilateral, Chords, Parallel.


Proposed Problem 71: Cyclic Quadrilateral.


Eyeball Theorem:
Animated Angle to Geometry Study. Cyclic quadrilateral 

Proposed Problem 134. Orthic
Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter. Cyclic
quadrilateral. 

Proposed Problem 39.
Triangle, Incircle, Bisector, Cyclic Quadrilateral and angles. 
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