Collinear Points, Theorems and
Problems  Table of Content 2




Dynamic Geometry Problem 1446.
Lemoine Line, triangle, circumcircle, tangent, collinear points. Stepbystep animation using GeoGebra. 

Geometry Problem 1440.
Intersecting Circles, Perpendicular Bisector, Collinear Points, Art, Poster, Typography, iPad Apps. 

Geometry Problem 1426. Two Squares, Collinear Points, Triangle, Quadrilateral, Sum of the Areas. 

Geometry Problem 1425. Two Squares, Collinear Points, Concurrent Lines. 

Geometry Problem 1409. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. 

Geometry Problem 1408. Right Triangle, Incircle, Excircle, Incenter, Midpoint, Tangency Point, Collinearity. 

Geometry Problem 1407. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. 

Geometry Problem 1406. Four Congruent Circles, Measurement, Metric Relations,
Sum of the Squares. 

Geometry Problem 1405. Four Congruent Circles, Congruent Chords. 

Geometry Problem 1404. Three Circles, Center, Intersecting Points, Collinearity, Congruence. 

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

Geometry Problem 1397. Circle, Diameter, Tangent, Secant, 90 Degrees Angle,
Perpendicular, Collinear Points. 

Geometry Problem 1393. Monge's Circle Theorem, Three Circles and Three Pair of Common Tangents, Collinearity. 

Geometry Problem 1385. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, Midpoint, Collinear Points. 

Geometry Problem 1350. Triangle with three Intersecting Circles, Incircle, Collinear Points. 

Problem 1343.
Triangle, Excircles, Circle, Tangent, Tangency Points, Chord, Perpendicular, 90 Degrees, Collinearity. Machu Picchu in the background.


Geometry Problem 1321.
Intersecting Circles, Diameter, Secant, Chord, Collinearity. 

Geometry Problem 1320.
Triangle, Incircle, Tangent, Chord, Circle, Parallel, Perpendicular, Collinearity. 

Geometry Problem 1306.
Cyclic, Inscribed Quadrilateral, Circle, Tangent, Diagonals, Collinear Points. 

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

Geometry Problem 1210
Circle, Tangent Line, Secant, Chord, Collinear Points. 

Geometry Problem 1191
Circle, Chords, Diameter, Congruence, Midpoint, Collinearity, Bisector. 

Geometry Problem 1140.
Triangle, Circumcircle, Circle, Center, Collinear Points. 

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

Geometry Problem 1122.
Triangle, 90 Degree, Perpendicular Lines, Orthocenter, Altitude, Midpoint, Collinear Points.


Geometry Problem
1106.
Regular Hexagon, Congruence, Diagonal, Collinear Points. 

Geometry Problem
1059.
Triangle, Circumcircle, Orthocenter, Altitude, Perpendicular, Reflection of a Point over a Line, Collinear Points, Simson Line, Congruence. 

Geometry Problem
1001.
Triangle, Circumcircle, Perpendicular, Perpendicular Bisector, Tangent, Collinear Points. 

Geometry Problem 984.
Triangle, Circumcircle, Altitudes, Midpoint, Collinear Points. 

Geometry Problem 966.
Triangle, Cevians, Midpoint, Circumcircle, Circle, Tangent Line,
Collinear Points. 

Geometry Problem 956.
Two Equilateral Triangles, Center, Collinear Points, Midpoint, Right
Triangle, 30, 60, 90 Degrees. 

Geometry Problem 898
Intersecting Circles, Common External Tangent, Secant,
Circumcenter, Collinear Points.
GeoGebra, HTML5 Animation for Tablets 
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