College Geometry Online, eLearning

Online Geometry: Angles Theorems and Problems- Table of Content, Page 1

Angle Index

Euclid's Elements 23 definitions

Euclid's Elements Book I, 23 Definitions. One-page visual illustration. Angles and more.
Euclid's Elements Book. Index.

Point, Theorems and Problems, Index

Points, Theorems and Problems - Index.

Acute Angle, Slideshow

Acute Angle in the Real World - Slideshow.

Wordflex Point

Meanings and syntactic of 'ANGLE'.
Created using Wordflex Touch Dictionary for iPad in association with Oxford University Press.

Obtuse Angle Index

Obtuse Angle. Theorems and Problems.

Angles 30, 60, 120 Index

Angles: 30, 60, 120 degrees.

Angle 45, 90, 135, Theorems and Problems

Angles: 45, 135 degrees.

Angle Bisector Index

Angle Bisector.

Isogonal Lines

Isogonal Lines.
Theorems and Problems.

Billiards and Geometry Index

Billiards and Geometry - Index
Angles of Incidence and Reflection.

Bisect an angle

Book I, Proposition 9: Bisect a given angle

Incenter, Incircle, Index

Incenter. Index.
Angle bisectors.

Excenter, Excircle, Index

Excenter. Index.
Interior and Exterior Angle bisectors.

Stone of twelve angles, Cuzco

Inca Stone of Twelve Angles, Cuzco. Tunnel effect.

Angle Bisector Theorem

Euclid's Elements Book VI, Proposition 3: Angle Bisector Theorem

Morley's Theorem

Animated illustration of the celebrated Morley's angle trisector theorem 

Morley's Triangle & Center: Trisection of angles.

Blanchet Theorem. Altitude, Angle Bisector.

Isogonic-Jacobi Theorem: Using TracenPoche Dynamic Geometry Software

Mascheroni Construction with compass alone. Midpoint of a segment. Equal angles.

Interactive Simson Line

Interactive Simson Line. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Vertical angles.

Interactive Geometry

Triangle: Incircle, Perpendicular, Angle Bisector. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Geometry problem 1329

Geometry Problem 1329.
Two Squares Side by Side, Parallel, Perpendicular, 90 Degrees, Congruence.

Geometry problem 1328

Geometry Problem 1328.
Two Squares Side by Side, Perpendicular, 90 Degrees, Congruence.

Geometry problem 1327

Geometry Problem 1327.
Two Squares Side by Side, Perpendicular, 90 Degrees, Angle.

Geometry problem 1326

Geometry Problem 1326.
Triangle, Cevian, Incenters, Sum of Angles, 270 Degrees.

Geometry problem 1324

Geometry Problem 1324.
Quadrilateral, Diagonal, 45 Degrees, Angle Bisector, Isosceles Triangle, Congruence.

Geometry problem 1323

Geometry Problem 1323.
Square, Angle Trisector, Diagonal, Regular Dodecagon, Area, 30-60 degrees.

Geometry problem 1322

Geometry Problem 1322.
Triangle, Angle Bisector, Circumcircle, Chord, Secant, Sum of two Angles.

Geometry problem 1299

Geometry Problem 1299.
Triangles, Interior Point, Angles, 30 degrees.

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 1295

Geometry Problem 1295.
Right Triangle, Incenter, Incircle, Excenter, Excircle, Congruence, Angle.

Geometry problem 1288

Geometry Problem 1288.
Triangle, 30-50-100 Degrees, Area, Inradius, Metric Relations, Measurement.

Geometry problem 1287

Geometry Problem 1287.
Triangle, 40-100-40 Degrees, Congruence, Area, Metric Relations, Measurement.

Geometry problem 1286

Geometry Problem 1286.
Triangle, Quadrilateral, 60, 135, 105 Degree Angles, Congruence, Measurement.

Geometry problem 1285

Geometry Problem 1285.
Triangle, Quadrilateral, 60, 150, 90 Degree Angles, Congruence, Measurement.

Geometry problem 1281

Geometry Problem 1281.
Triangle, Circle, Diameter, Tangent, Altitude, Congruent Angles.

Geometry problem 1274

Geometry Problem 1274.
Isosceles Triangle, 80-20-80 Degrees, Area, Inradius, Circumradius, Angle Bisector, Metric Relations, Measurement.

Geometry problem 1273

Geometry Problem 1273.
Circle, Tangent, Secant, Midpoint, Isogonal Lines, Congruent Angles.

Geometry problem 1178

Geometry Problem 1178
Triangle, Angle Bisector, Metric Relations.

Geometry problem 1177

Geometry Problem 1177
Triangle, Two Angle Bisectors, Metric Relations.

Geometry problem 1174

Geometry Problem 1174
Triangle, Quadrilateral, Double, Triple, Angle, Congruence, Excenter, Angle Bisector.

Geometry problem 1173

Geometry Problem 1173
Triangle, Cevian, Angle, Congruence, Similarity.

Geometry problem 1152

Geometry Problem 1152.
Triangle, Quadrilateral, Angle, 10, 20, 30 Degrees.

Geometry problem 1146

Geometry Problem 1146.
Triangle, Interior Point, 10, 20, 30, 130 degrees, Congruence.

Geometry problem 1138

Geometry Problem 1138.
Square, Perpendicular, Angle, 90 Degrees, Triangle, Congruence.

Geometry problem 1128

Geometry Problem 1128.
Right Triangles, Medians, Parallel, Angles, Congruence, Half the measure.

Geometry Problem 1119

Geometry Problem 1119.
Quadrilateral, Similar Triangles, Midpoints, Equal Ratio, Angles.

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Last updated: Apr 10, 2017