Online Geometry: Tangential or Circumscribed Quadrilateral, Theorems and Problems

Tangential or Circumscribed Quadrilateral, Theorems and Problems - Index

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.

Six Tangential or Circumscribed Quadrilaterals Theorem.

Eight-Point Circle Theorem
Step-by-Step 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.

Geometry Online Glossary .
Geometry Glossary based on the new New York State mathematics standards initiative.