College Geometry Online, eLearning

Online Geometry: Equilateral Triangles, Theorems and Problems - Page 1

Equilateral triangles

Euclid's Elements 23 definitions

Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Equilateral triangle.

Euclid's Elements Book I, Proposition 3

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.
Equilateral triangle.

Euclid's Elements Book I, Proposition 2

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.
Equilateral triangle.

Euclid's Elements Book I, Proposition 1

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

Euclid's Elements Book XIII, Proposition 10

Euclid's Elements, Book XIII, Proposition 10 One page visual illustration.

Napoleon Theorem and Problem Index

Napoleon's theorems and problems, Index.
Equilateral triangle.

Equilateral triangles

Geometry Problem 404.
External Equilateral triangles, Congruent and Concurrent Lines.

Da Vinci Tetrahedron Jenn 3D Coxeter polytopes

Da Vinci Tetrahedron and Jenn 3D tool for visualizing Coxeter polytopes.
Jenn 3D is a free software license program for visualizing regular polytopes in stereographic projection.

Da Vinci Octahedron, Jenn3D

Da Vinci Octahedron and Jenn 3D tool for visualizing Coxeter polytopes.
Jenn 3D is a free software license program for visualizing regular polytopes in stereographic projection.

Da Vinci Icosahedron, Jenn3D

Da Vinci Icosahedron and Jenn 3D tool for visualizing Coxeter polytopes.
Jenn 3D is a free software license program for visualizing regular polytopes in stereographic projection.

Optical Prism with Equilateral Triangle Form

Optical Prism with Equilateral Triangle Form.
Scene created using Prism HD for iPad.

Second Fermat Point

Second Fermat Point: Static diagram.
Second Fermat Point: Dynamic diagram.
Triangle, Equilateral triangles, Concurrent lines, GeoGebra, HTML5 Animation for Tablets (iPad, Nexus)

Lester Circle Theorem

Lester Circle Theorem.
Equilateral Triangle.

Geometry problem 1284

Geometry Problem 1284.
Two Equilateral Triangle, Midpoint, Congruence.

Geometry problem 1283

Geometry Problem 1283.
Two Equilateral Triangle, Perpendicular, Midpoint.

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 1275

Geometry Problem 1275.
Equilateral Triangle, Perpendicular, Projection, Metric Relations, Measurement.

Geometry problem 1238

Geometry Problem 1238
Square, Equilateral Triangle, Metric Relations. Mobile Apps.

Geometry problem 1234

Geometry Problem 1234
Quadrilateral, 60 Degrees, Midpoint, Congruence, Cyclic Quadrilateral, Concyclic Points.

Geometry problem 1230

Geometry Problem 1230
Quadrilateral, 60 Degrees, Congruence, Metric Relations.

Geometry problem 1225

Geometry Problem 1225
Equilateral Triangle, Circumcircle, Angle Bisector, Congruence.

Geometry problem 1220

Geometry Problem 1220
Equilateral Triangles, Midpoints, 60 Degrees, Congruence.

Geometry problem 1219

Geometry Problem 1219
Equilateral Triangles, Midpoints, 60 Degrees, Congruence, Rhombus.

Geometry problem 1218

Geometry Problem 1218
Triangle, Equilateral Triangles, Midpoints.

Geometry problem 1212

Geometry Problem 1212
Equilateral Triangle, Equilateral Hexagon, Concurrent Lines.

Geometry problem 1205

Geometry Problem 1205
Triangle, Centroid, Outer and Inner Napoleon Equilateral Triangles.

Geometry problem 1199

Geometry Problem 1199
Equilateral Triangle, Square, Altitude, Circle, Incircle, Inradius, Metric Relations.

Geometry problem 1194

Geometry Problem 1194
Equilateral Triangle, Perpendicular, Distance, Side, Metric Relations.

Geometry problem 1161

Geometry Problem 1161.
Scalene Triangle, 60 Degrees, Angle, Orthocenter, Circumcenter, Equilateral Triangle, Congruence.

Geometry problem 1147

Geometry Problem 1147.
Scalene Triangle, Orthocenter, Circumcenter, Congruence, Equilateral Triangle.

Geometry problem 1126

Geometry Problem 1126.
Equilateral Triangle, Circumcircle, Metric Relation, Harmonic Mean.

Geometry problem 1125

Geometry Problem 1125.
Triangle, Four Equilateral Triangles, Centroid, Midpoint.

Geometry Problem 1120

Geometry Problem 1120.
Isosceles Right Triangle, 120 Degree, Angle, Equilateral, Metric Relations.

Geometry Problem 1115

Geometry Problem 1115.
Right Triangle, Angle Trisection, Equilateral Triangle.

Geometry Problem 1092

Geometry Problem 1092.
Equilateral Triangle, Square, Circle, Tangent, 90 Degree, Sangaku.

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Last updated: Nov 8, 2016