Circles  Table of Content
(Page 2)




GeoGebra,
Dynamic Geometry, Euclidean Egg, StepbyStep Construction
HTML5 Animation for Tablets (iPad, Nexus) 

Billiards and Geometry 
Index
Billiards Ball. 

Lemoine Line Theorem,
Interactive illustration.
HTML5 Animation for iPad and Nexus 

GeoGebra, Dynamic Geometry:
Lemoine Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) 

GeoGebra, Dynamic Geometry:
Simson Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) 

Lester Circle Theorem.


Word
Cloud of Circle.
Visual Summary. 

Circumcenter.
Index.


Incenter of a triangle.
Index.


Excenter.
Index.
Excircle, Exradius.


GeoGebra, Dynamic Geometry:
Internal Feuerbach Point
HTML5 Animation for Tablets (iPad, Nexus..) 

Soddy Circles and Descartes Theorem.
Three tangent circles,
Inscribed and Circumscribed Circles, Radii. 

Mascheroni
construction with compass alone. Index


Ptolemy's Theorems and Problems  Index. 

Brahmagupta Theorem and Problems  Index
Brahmagupta (598–668) was an Indian mathematician and astronomer who discovered a neat formula for the area of a cyclic quadrilateral. 

Tangential
or Circumscribed Quadrilateral


Mascheroni construction: Find the center of a circle with compass alone.


Mascheroni construction: Construct the circumcircle of
a triangle with compass alone.


Euclid's Elements Book I, Proposition 3: Given two unequal straight lines, to cut off from the greater a straight line equal to the less 

Euclid's Elements Book I, Proposition 2: To place at a given point (as an extremity) a straight line equal to a given straight line 

Euclid's Elements Book I, Proposition 1:
On a given finite line to construct an equilateral triangle 

Distance between the Incenter and the Centroid of a Triangle.
Formula in terms of the sides a,b,c. 

Distances between Triangle Centers
Index.


Tangential or Circumscribed Quadrilateral:
Diagonals, Inradii Theorem. 

Geometric Art: Isolines or Contour Lines of Problem 1150, Circle, Perpendicular Secants, 90 Degrees, Parallel Lines 

Six Tangential or Circumscribed Quadrilaterals Theorem. 

iPad Apps: Geometry Designer Illustration. Four Circles Theorem.
Interactive Geometry Software for iPad, iPhone, iPod. 

Johnson's Theorem,
Intersecting circles.
HTML5 Animation 
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