# Circle Tangent Line, Theorems and Problems - Table of Content, Page 1 of 5

Incircle of a triangle. Index.
Tangent line to a circle

Excircle. Index.
Tangent line to circle.

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..)

Geometry Problem 939.
Circle, Tangent, Secant, Chord, Parallel, Midpoint.

Geometry Problem 937.
Triangle, Circumcircle, Circles, Tangent, Sides, Midpoint.

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

Geometry Problem 924.
Quadrilateral, Diagonal, Perpendicular, Circle, Tangent, Midpoint, Metric Relations.

Geometry Problem 922.
Circle, Tangent Lines, Tangency Points, Chord, Secant, Harmonic Mean.

Geometry Problem 921.
Right Triangle, Circumcircle, Arc, Midpoint, Tangency Point, Incircle.

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

Geometry Problem 909.

Geometry Problem 908.

Geometry Problem 907.

Static Diagram of problem 901
Dynamic Geometry Problem 901
Intersecting Circles, Common External Tangent, Secant, Circumcircle, Concyclic Points, Cyclic Quadrilateral. GeoGebra, HTML5 Animation for Tablets

Geometry Problem 899
Intersecting Circles, Common External Tangent, Secant, Concyclic Points, Cyclic Quadrilateral. GeoGebra, HTML5 Animation for Tablets

Geometry Problem 895
Triangle, Incircle, Tangency Points, Parallel line, Collinear Points.
GeoGebra, HTML5 Animation for Tablets

Geometry Problem 893
Triangle, Circumcircle, Incenter, Circle, Tangent, Collinear Points.
GeoGebra, HTML5 Animation for Tablets

Geometry Problem 885
Intersecting Circles, Three Tangent Lines, Midpoint.

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

Geometry Problem 863
Circumscribed trapezoid, Inscribed Circle, Tangent, Metric Relations.

Geometry Problem 861
Triangle, Incircle, Parallel, Tangent, Metric Relations.

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

Geometry Problem 795
Intersecting Circles, Common Chord, Midpoint, Tangent, Secant Line, Perpendicular, 90 Degrees.

Geometry Problem 792
Right Triangle, Altitude, Angle Bisector, Three Incircles, Five Concyclic Points, Circles.

Geometry Problem 790
Right Triangle, Altitude, Angle Bisector, Incircle, Tangency Point, Inradius, Circles, Tangent Line, Congruence.

Geometry Problem 789
Right Triangle, Altitude, Angle Bisector, Incircle, Tangency Point, Inradius, Circles, Tangent Line.

Geometry Problem 787
Right Triangle, Inradius, 18 Equal Circles, Line Tangent, Legs, Hypotenuse, Ratio, Metric Relations.

Geometry Problem 774
Triangle, Two Altitudes, Circumcircle, Tangent at a Vertex, Parallel.

Geometry Problem 767
Equilateral Triangle, Circle tangent to a side, Tangent line, Measurement, Secant.

Geometry Problem 752.
Square, Circle, Tangent, Chord, Angle.

Geometry Problem 738.
Intersecting Circles, External Common Tangent, Common Chord, Secant, Circumcircle, Cyclic Quadrilateral, Concyclic Points.

Geometry Problem 724.
Circumscribed Quadrilateral, Circle, Angle, Incenter, Half the Measure, Tangent line to circles.

Geometry Problem 713.
Tangent Circles, Diameter, Chord, Tangent line to circles, Incenter, Incircle, Triangle.

Geometry Problem 712.
Semicircle, Diameter, Tangent, Perpendicular, Angle Measure, Tangent line to circle.

Geometry Problem 707.
Triangle, Excenters, Angle Bisectors, Angle, Measurement, Tangent line to circles.

Geometry Problem 703.
Triangle, Incircle, Tangency point, Diameter, Congruence, Tangent line to circles.

Geometry Problem 697.
Square, Circle, Sector, Segment, Tangent line to circles, Inscribed, Congruence, Mind Map, Polya.

Geometry Problem 693.
Square, Inscribed and Circumscribed Circle, Areas, Mind Map, Tangent line to circle.

Geometry Problem 692.
Quatrefoil, Four Equal Circles and a Circle Inscribed in a Square, Areas, Mind Map, Tangent line to circle.

Problem 690: Distance between the Incenter and the Centroid of a Triangle.
Formula in terms of the sides a,b,c. Tangent line to circle.

Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines, Concurrent Lines, Mind Map.

Geometry Problem 687.
Triangle, Three Excircles, Tangency points, Concurrent Lines, Tangent line to circle
.

Geometry Problem 686.
Triangle, Three Excircles, Tangency points, Tangent lines to circle, Semi-perimeter, Congruence.

Geometry Problem 684: Outer Nagel Point.
Triangle, Excircles, Incircle Tangency points, Concurrent lines, Tangent line to circle, Semi-perimeter, Ceva theorem.

Geometry Problem 683: Nagel Point.
Triangle, Excircles, Tangency points, Concurrent lines, Tangent line to circle, Semi-perimeter, Ceva theorem.

Geometry Problem 682: Gergonne External Point.
Triangle, Excircle, Tangency points, Concurrent lines, Tangent line to circle, Semiperimeter, Ceva theorem.

Geometry Problem 681: Gergonne Point.
Triangle, Incircle, Tangency points, Concurrent lines, Tangent line to circle, Semiperimeter, Ceva theorem.

Geometry Problem 676.
Circles, Diameter, Tangent line to circle, Chord, Metric Relations.

Geometry Problem 673.
Internally tangent circles, Chord, Tangent line to circle, Metric Relations.

Geometry Problem 672.
Internally tangent circles, Chord, Tangent line to circle, Geometric Mean.

Geometry Problem 670.
Triangle, 60 Degrees, Orthocenter, Incenter, Circumcenter, Congruence, Tangent line to circle.

Geometry Problem 669.
Triangle, Circumcircle, Incenter, Tangent line to circle, Midpoint, Collinear points, Mind Map.

Geometry Problem 668.
Right triangle, Incircles, Parallel, Common Tangent, Tangent line to circle, Mind Map.

Geometry Problem 667.
Intersecting Circles, Secant, Tangent line to circle, Metric Relations, Mind Map.

Geometry Problem 666.
Intersecting Circles, Secant, Tangent line to circle, Concyclic points, Mind Map.

Geometry Problem 665.
Intersecting Circles, Secant, Tangent line to circle, Angles, Mind Map.

Geometry Problem 662.
Triangle, Incenter, Circumcenter, Orthocenter, Circle, Tangent line to circle, Angle, Measurement.

Geometry Problem 657.
Triangle, Incircle, Tangency Points, Parallel Lines, Congruence, Tangent line to circle.

Geometry Problem 652.
Archimedes Book of Lemmas: Proposition 12
Perpendicular chords, Arcs, Radius, Tangent line to circle.

Geometry Problem 649.
Archimedes Book of Lemmas: Proposition 10
Tangent, Chord, Perpendicular, Parallel, Midpoint, Tangent line to circle.

Geometry Problem 646.
Archimedes Book of Lemmas: Proposition 7
Square,Inscribed and Circumscribed Circles, Area., Tangent line to circle.

Geometry Problem 644.
Archimedes Book of Lemmas: Proposition 5
Semicircle, Circle, Perpendicular, Arbelos, Archimedean Twins, Tangent line to circle.

Geometry Problem 643.
Archimedes Book of Lemmas: Proposition 4
Semicircle, Circle, Perpendicular, Arbelos, Area, Tangent line to circle.

Geometry Problem 641.
Archimedes Book of Lemmas: Proposition 2
Semicircle, Perpendicular, Midpoint, Tangent line to circle.

Geometry Problem 639
Semicircle, Diameter, Perpendicular, Inscribed Circle, Tangent line to circle, Arbelos, Congruence.

Geometry Problem 637
Semicircle, Diameter, Perpendicular, Inscribed Circle, Chord, Tangent line to circle, Arbelos.

Geometry Problem 636
Semicircle, Diameter, Perpendicular, Inscribed Circle, Common Tangent, Tangent line to circle.

Geometry Problem 635
Semicircle, Diameter, Perpendicular, Inscribed Circle, Radius, Tangent line to circle.

Geometry Problem 630: Clawson Point.
Orthic and Extangents Triangles, Concurrent lines, Tangent line to circle.

Geometry Problem 626
Triangle, Distance from the Incenter to an Excenter. Tangent line to circle.

Geometry Problem 624
Triangle, Incenter, Excenter, Incircle, Excircle, Similarity, Tangent line to circle.

Geometry Problem 623
Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points, Tangent line to circle.

Geometry Problem 619
Triangle Area, 30 Degrees, Incircle, Incenter, Tangent line to circle.

Geometry Problem 618
Triangle Area, 60 Degrees, Incircle, Incenter, Tangent line.

Geometry Problem 617
Right Triangle Area, Incircle, Incenter, Tangent line to circle, 90 Degrees.

Geometry Problem 610
Intersecting Circles, Radius, Parallel, Common Tangent, Tangent line to circle, Angle, 90 Degrees.

Geometry Problem 600
Circle, Area, Tangent, Semicircle, Tangency Point, Tangent line to circle.

Brianchon's Theorem in a Circumscribed Hexagon.
Tangent line to circle.

Brianchon Corollary, Circumscribed Hexagon, Concurrency lines.
Tangent line to circle.

Carnot's Theorem in an Acute Triangle.
Tangent line to circle.

Carnot's Theorem in an Obtuse Triangle.
Tangent line to circle.

Geometry Problem 594
Triangle, Incenter, Incircle, Inradius, Tangency Point, Tangent line to circle, Midpoint, Altitude, Angle, Half the Difference.

Geometry Problem 592
Triangle, Incenter, Incircle, Tangency Point, Tangent line to circle, Midpoints, Concurrent Lines, Congruence.

Geometry Problem 591
Triangle, Incenter, Incircle, Inradius, Tangency Point, Tangent line to circle, Midpoint, Altitude.

Geometry Problem 590
Triangle, Incenter, Incircle, Tangency Point, Tangent line to circle, Midpoint, Areas.

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