College Geometry Online, eLearning

 

Online Geometry: Equilateral Triangles, Theorems and Problems - Page 3

Equilateral triangles 

 

Equilateral triangle, circumcircle

Proposed Problem 366.
Scalene triangle, Circumcircle, Angles, 60 Degrees, Equilateral triangle.

Circular sector 60 degrees

Proposed Problem 365.
Circular Sector of 60 degrees, Midpoints, Perpendicular, Congruence.

Equilateral triangle and semicircle

Proposed Problem 326.
Equilateral triangle, Semicircle, Equal arcs.

Elearning: Napoleon Theorem III

Proposed Problem 248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.

Napoleon Theorem II

Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon triangle.

Napoleon Theorem I

Proposed Problem 246.
Napoleon's Theorem I. External Equilateral triangles.

Angle trisectors and Equilateral triangle

Morley's Triangle & Center: with interactive animation and manipulation.

Regular hexagon inscribed in a circle

Proposed Problem 262.
Regular Hexagon inscribed in a circle, sum of distances.

Elearning 260: Problem about equilateral triangle

Proposed Problem 260.
Equilateral Triangle, Incircle, Tangency Points, Vertices, Distances, Squares.

Elearning 259: Equilateral triangle, Incircle

Proposed Problem 259.
Equilateral Triangle, Incircle, Tangency Points, Side, Distances, Squares.

Elearning 258: Equilateral triangle, Incircle

Proposed Problem 258.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances, Squares.

Problem 257: Equilateral triangle, circumcircle

Proposed Problem 257.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances, Squares.

Elearning 256: Equilateral triangle

Proposed Problem 256.
Equilateral Triangle, Circumcircle, Point, Vertices, Distances.

Elearning 245: Parallelogram

Proposed Problem 245. Parallelogram with Equilateral triangles

Elearning 243

Proposed Problem 243. Triangle with Equilateral triangles, Parallelogram.

Elearn 242: Equilateral triangle and parallelogram

Proposed Problem 242. Triangle with Equilateral triangles, Parallelogram.

Equilateral triangle, congruence SAS

Proposed Problem 241. Triangle with Equilateral triangles, Congruence.

Triangle with equilateral triangles

Proposed Problem 240. Triangle with Equilateral triangles, Parallelogram.

Viviani theorem extension, regular polygon

Proposed Problem 225. Viviani's Theorem Extension, Regular Polygon, Apothem, Distance.  

Viviani theorem, Equilateral triangle, exterior point

Proposed Problem 222. Viviani's theorem, Equilateral triangle, Exterior point, Distances.  

Viviani's theorem I

Proposed Problem 221. Viviani's theorem, Equilateral triangle, Interior point, Distances.  

Elearn 212: 120 degree triangle, area

Proposed Problem 212. 120 Degree Triangle, Equilateral triangles, Areas.

Elearn 211: 60 degree triangle, area

Proposed Problem 211. 60 Degree Triangle, Equilateral triangles, Areas.

Reuleaux Rotor

Geometry in Action. Reuleaux's rotor: How Round is your Circle? The Reuleaux triangle is a constant width curve based on an equilateral triangle.

Elearning 132

Proposed Problem 132.
Triangle, 60 degree, Orthocenter, Congruence, Midpoint.

 

Elearning 103.

Proposed Problem 103.Equilateral Triangle Area, Interior Point, Heron's Formula.

Problem 102. Elearning, Online Tutoring

Proposed Problem 102.Equilateral Triangle Area, Interior Point.

Elearning, Online Tutoring 101

Proposed Problem 101.Equilateral Triangle, Pythagorean Theorem, Angles.

Machu Picchu and Sierpinski Triangle. The canonical Sierpinski triangle uses an equilateral triangle with a base parallel to the horizontal axis.

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