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Geometry: Tangent Circles, Theorems and Problems, Page 1

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Tangent Circles Index

Second Ajima-Malfatti Point
Interactive illustration.
Tangent circles.

First Ajima-Malfatti Point
Animated illustration.
Tangent circles.

Sawayama -Thebault's theorem
Tangent circles.

Apollonius' Problem for Three Circles Illustration with animation and sound.
Tangent circles

Seven Circles Theorem
Tangent circles.

Soddy Circles and Descartes Theorem

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

Arbelos, Theorems and Problems Index

Arbelos, Theorems and Problems
Three tangent semicircles with collinear centers.
Index 

Euclidean Egg  with 8 Arcs in 5 Steps, Step-by-Step Construction. HTML5 Animation

GeoGebra, Dynamic Geometry, Euclidean Egg with 8 Arcs in 5 Steps, Step-by-Step Construction
HTML5 Animation for Tablets (iPad, Nexus)

Euclidean Egg, Step-by-Step Construction. HTML5 Animation

GeoGebra, Dynamic Geometry, Euclidean Egg, Step-by-Step Construction
HTML5 Animation for Tablets (iPad, Nexus)

Art: Tangent Circles and Delaunay

Geometric Art: Tangent Circles, Delaunay Triangulation, iPad, iPhone App: Trimaginator.

Problem 1435

Geometry Problem 1435.
Circle, Diameter, Inscribed Circles, Circular Sector, Parallelogram, Parallel Lines, Tangency Points, Poster, Typography, iPad Apps.

Problem 1434

Geometry Problem 1434.
Equilateral Triangle, Tangent Circles, Tangent Lines, Arithmetic Mean, Measurement, Poster, Typography, iPad Apps.

Problem 1433

Geometry Problem 1433.
Tangent Circles, Diameter, Perpendicular, Midpoint, Measurement, Poster Typography, iPad Apps.

Problem 1432

Geometry Problem 1432.
Tangent Circles, Secant, Tangent Lines, Proportionality, Similarity, Poster Typography, iPad.

Problem 1431

Geometry Problem 1431.
Triangle, Circumcircle, Parallel Chord, Apollonius, LLC, Congruent Angles, Poster, Conformal Mapping.

Problem 1427

Geometry Problem 1427.
Circle inscribed in a square, Arc, Tangent Line, Tangent Circles, Radii.

Problem 1421

Geometry Problem 1421.
Right Triangle, Incircle, Excircle, Tangent Lines, Measurement.

Problem 1420

Geometry Problem 1420.
Regular Hexagon, Inscribed Circle, Area, Tangent Circles, Tangent Line.

Problem 1419

Geometry Problem 1419.
Triangle, Altitude, Circumcircle, Incenter, Inradius, Perpendicular, Angle Bisector, Midpoint.

Problem 1417

Geometry Problem 1417.
Triangle, Cevian, Circumcircle, Incenter, Perpendicular, Angle Bisector, Tangent Lines, Tangent Circles.

Problem 1402

Geometry Problem 1402.
Triangle, Three Tangent Circles, Parallel Diameter, Collinear Points.

Geometry problem 1362

Geometry Problem 1362.
Equilateral Triangle Inscribed in a Circle, Lunula, Ratio of Areas, Tangent, Sketch, iPad Apps.

Geometry problem 1353

Geometry Problem 1353.
Tangent Circles, Perpendicular Diameters, Congruence, 30 Degrees.

Geometry problem 1314

Geometry Problem 1314.
Equilateral Triangle, Incircle, Inscribed Circle, Tangent, Congruence.

Geometry problem 1301

Geometry Problem 1301.
Arbelos, Semicircles, Diameters, Circle, Incircle, Incenter, Square, Midpoint, Concurrency.

Geometry problem 1300

Geometry Problem 1300.
Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Perpendicular, Concurrent Lines.

Geometry problem 1298

Geometry Problem 1298.
Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Angle Bisector, Perpendicular, Midpoint.

Geometry problem 1297

Geometry Problem 1297.
Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Angle Bisector.

Geometry problem 1277

Geometry Problem 1277.
Equilateral Triangle, Circumcircle, Externally Tangent Circles, Tangent Line, Measurement.

Geometry problem 1276

Geometry Problem 1276.
Equilateral Triangle, Circumcircle, Internally Tangent Circles, Tangent Line, Measurement.

Geometry problem 1229

Geometry Problem 1229
Three Tangent Circles, Midpoint, Common Tangent Line, 3-4-5 Right Triangle.

Geometry problem 1228

Geometry Problem 1228
Three Tangent Circles, Midpoint, Major Arc, Common Tangent Line, Square.

Geometry problem 1216

Geometry Problem 1216
Circle, 90 Degrees, Tangent, Common Chord, Collinearity.

Geometry problem 1168

Geometry Problem 1168
Construction of the Inscribed Circle of the Arbelos, Semicircles, Diameter, Circle, Triangle, Circumcircle, Tangent.

Geometry problem 1158

Geometry Problem 1158.
Four Tangent Circles, Tangent Chord, Radius, Metric Relations.

Geometry problem 1157

Geometry Problem 1157.
Four Circles, Mutually Tangent, 90 Degrees, Radius, Metric Relations.

Geometry problem 1154

Geometry Problem 1154.
Sangaku Three circles and a tangent line.

Geometry problem 1148

Dynamic Geometry Problem 1148
Static Geometry Problem 1148.
Right Triangle, Circle, Incircle, Circumcircle, Tangent, Radius. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus).

Geometry problem 1143

Geometry Problem 1143.
Triangle, Circumcircle, Tangent Line, Reflection of a Point over a Line, Tangent Circles, Collinear Points.

Geometry problem 1137

Geometry Problem 1137.
Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint, Arc, Collinear Points, Tangent Circles.

Geometry problem 1134

Geometry Problem 1134.
Tangent Circles, Tangent Line, Triangle, Circumcircle, Circumcenter.

Geometry Problem 1096

Geometry Problem 1096.
Tangent Circles, Common Tangent, Chord, Radius, Center.

Geometry Problem 1095

Geometry Problem 1095.
Externally Tangent Circles, Common Tangent, Radius, Metric Relations.

Geometry Problem 1094

Geometry Problem 1094.
Tangent Circles, Tangent Chord, Radius, Sagitta of Arc.

Geometry Problem 1093

Geometry Problem 1093.
Square, Circle, Tangent, Radius, Side, Sangaku, Japanese Geometry Problem.

Geometry Problem 1087

Geometry Problem 1087.
Tangent Circles, Parallel, 15 Degrees, Angle.

Geometry Problem 1081

Geometry Problem 1081.
Equilateral Triangle, Inscribed Circle, Inradius, Tangent Circles, Radius, Tangent Line, Sangaku Japanese Problem.

Geometry Problem 1077

Geometry Problem 1077.
Chain of Equal Tangent Circles, Circular Sector, Area, Sangaku, Sacred Geometry.

Geometry Problem 1071

Geometry Problem 1071.
Arbelos, Semicircles, Diameter, Circle, Perpendicular, Common Tangent, Parallel, Collinear Points, 90 Degrees, Midpoint.

Geometry Problem 1048

Geometry Problem 1048.
Circles, Tangent, Perpendicular, Diameter, Angle Bisector.

Geometry Problem 1009

Geometry Problem 1009.
Tangent Circles, Common External Tangent, Common Internal Tangent, Arithmetic Mean.

Geometry Problem 1008

Geometry Problem 1008.
Three Equal Tangent Circles, Sum of Tangent Lines, Tangency Points.

Geometry Problem 1006

Geometry Problem 1006.
Tangent Circles, Common External Tangent, Bicentric Trapezoid, Incenter, Circumcenter.

Geometry Problem 989

Geometry Problem 989.
Arbelos, Semicircles, Diameter, Perpendicular, 90 Degree, Common External Tangent, Rectangle, Midpoint of Arc.

Geometry Problem 987

Geometry Problem 987.
Triangle, Circumcircle, Incenter, Chord, Parallel, Circle, Tangent. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus).

Geometry Problem 952

Geometry Problem 952.
Triangle, Incenter, Circumcenter, Three Equal Circles, Tangent Line, Tangent Circles, Collinear Points.

Problem 941

Geometry Problem 941.
Circles Tangent Externally, Tangent, Secant, Proportion, Angle.

Problem 936

Geometry Problem 936.
Circle, Semicircle, Diameter, Tangent, Radius, Chord, Metric Relations.

Tangent Circles, Diameter, Perpendicular, Triangle, Area, Tangency Point

Geometry Problem 823.
Tangent Circles, Diameter, Perpendicular, Chord, Secant, Triangle, Area, Tangency Point.

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Last updated: May 24, 2019