

Online Geometry: Tangential or Circumscribed
Quadrilateral, Theorems and Problems

Tangential or Circumscribed
Quadrilateral, Theorems and Problems  Index




Geometry Problem 1351. Two Tangential or Circumscribed Quadrilaterals, Midpoints, Perpendiculars. 

Geometry Problem 1181
Cyclic Quadrilateral and Tangential Quadrilateral, Diameter as a Diagonal, Incenter, Circumcenter. 

Geometry Problem 910.
Bicentric Quadrilateral, Distance between the Incenter and Circumcenter, Incircle, Circumcircle, Circumscribed, Inscribed, Circumradius.


Geometry Problem 909.
Bicentric Quadrilateral, Incircle, Circumcircle, Circumscribed, Inscribed, Tangent, Inradius,
Distance.


Geometry Problem 908.
Bicentric Quadrilateral, Incircle, Circumcircle, Circumscribed, Inscribed, Tangent, Inradius.


Geometry Problem 907.
Bicentric Quadrilateral, Incircle, Circumcircle, Circumscribed, Inscribed, Tangent, Inradius.


Geometry Problem 906.
Bicentric Quadrilateral, Incircle, Circumcircle, Circumscribed, Inscribed, Perpendicular.


Geometry Problem 883
Five Circumscribed Quadrilaterals, Circle, Tangent, Common Tangent. 

Geometry Problem 817. Two
circles, Tangent Lines, Circumscribed Quadrilaterals. 

Geometry Problem 816.
Tangential or Circumscribed Quadrilateral: Pitot Theorem 

Tangential or Circumscribed Quadrilateral: Diagonals, Altitudes Theorem. 

Tangential or Circumscribed Quadrilateral: Diagonals, Inradii Theorem. 

Proposed Problem 371.
Square, Inscribed circle, Triangle, Area. 

Proposed Problem 352.
Tangential quadrilateral, Incircles, Common tangent, Circumscribable or
Tangential quadrilateral. 

Proposed Problem 351.
Rhombus, Incircles, Common tangent, Circumscribable or Tangential
quadrilateral. 

Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem 

EightPoint Circle Theorem
StepbyStep construction, Manipulation, and animation. 

Geometry Problem
724.
Circumscribed Quadrilateral, Circle, Angle, Incenter, Half
the Measure. 

Proposed Problem 331.
Square, Point on the Inscribed Circle, Tangency Points. 

Proposed Problem 322.
Square, Inscribed circle, Tangent, Triangle area. 

Newton's
Theorem: Newton's Line. Circumscribed quadrilateral, midpoints of
diagonals, center of the circle inscribed.


Proposition 7
Square and inscribed and circumscribed Circles


Proposed Problem 153.
Circumscribed Quadrilateral, Diagonals Concurrent with Chords.


Proposed Problem 152.
Circumscribed Quadrilateral, Diagonal, Chord, Proportion.


Proposed
Problem 76: Area of a Circle.
Square, Circle, Circular Sector.


Proposed Problem 62: Square
Diagonal, Inscribed Circle. 

Puzzle of the Newton's
Theorem: 50 pieces of circles. 






