Angles 30, 60, 90, 120, Theorems and Problems - Table of Content
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Geometry Problem
619
Triangle Area, 30 Degrees, Incircle, Incenter, Tangent. |
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Geometry Problem
618
Triangle Area, 60 Degrees, Incircle, Incenter, Tangent. |
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Proposed Problem 405.
Quadrilateral, 60, 75, and 135 degrees, Midpoint. |
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Proposed Problem 368.
Triangle, 120 degrees, Angle bisectors, Perpendicular. |
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Proposed Problem 365.
Circular Sector of 60 degrees, Midpoints, Perpendicular, Congruence. |
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Proposed Problem 304.
Triangle, Angle bisector of 120 degrees. |
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Proposed Problem 302.
Triangle, Angle bisector of 60 degrees. |
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Equilic Quadrilateral.
60 and 120 degrees |
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Proposed Problem 281.
Triangles, Angles, Isosceles, Equilateral.
60 degrees angle. |
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Proposed Problem 276.
Square, 90 degree Arcs, 60 degrees angle, Circle, Radius. |
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Proposed Problem 274.
Isosceles Triangle, 80-80-20, Angles.
60 degrees angle. |
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Proposed Problem 262.
Regular Hexagon inscribed in a circle, sum of distances, 60 degrees
angle. |
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Proposed Problem 260.
Equilateral Triangle, Incircle, Tangency Points, Vertices, Distances,
Squares, 60 degrees angle.
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Proposed Problem 259.
Equilateral Triangle, Incircle, Tangency Points, Side, Distances,
Squares, 60 degrees angle.
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Proposed Problem 258.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances,
Squares, 60 degrees angle.
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Proposed Problem 257.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances,
Squares, 60 degrees angle.
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Proposed Problem 256.
Equilateral Triangle, Circumcircle, Point, Vertices, Distances, 60
degrees angle.
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Proposed Problem 248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area, 60
degrees angle.
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Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle, 60 degrees angle.
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Proposed Problem 246.
Napoleon's Theorem I. External Equilateral triangles, 60 degrees angle. |
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Proposed Problem 245. Parallelogram with Equilateral triangles
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Proposed Problem 243. Triangle with Equilateral triangles,
Parallelogram.
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Proposed Problem 242. Triangle with Equilateral triangles,
Parallelogram, 60 degrees angle.
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Proposed Problem 241. Triangle with Equilateral triangles,
Congruence.
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Proposed Problem 240. Triangle with Equilateral triangles,
Parallelogram, 60 degrees angle.
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Proposed Problem 222. Viviani's theorem, Equilateral triangle,
Exterior point, 60 degrees angle, Distances. |
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Proposed Problem 221. Viviani's theorem, Equilateral triangle,
Interior point, Distances, 60 degrees angle. |
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Proposed Problem 212. 120 Degree Triangle, Equilateral triangles,
Areas.
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Proposed Problem 211. 60 Degree Triangle, Equilateral triangles,
Areas.
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Proposed Problem 210. Triangle, Angles, Auxiliary Lines, 60 degrees
angle.
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Proposed Problem 199. Triangle, Quadrilateral, Angles.
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Proposed Problem 185. Trapezoid,
Triangles and Angles,
60 degrees angle.
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Proposed Problem 184. Triangle
and Angles,
60 degrees angle.
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Proposed Problem 182. Overlapping
Circles, Find an angle,
60 degrees angle.
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Proposed Problem 132. Triangle,
60 degrees, Orthocenter, Congruence, Midpoint. |
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Euclid's
Elements, Book XIII, Proposition 10 One page visual illustration,
60 degrees angle. |
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Geometry of Circles "Sesame Street" by Philip Glass, 1979,
60 degrees angle.
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Proposed
Problem 50. Triangle with Equilateral triangles,
60 degrees angle.
Seventeen conclusions.
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Proposed Problem 44.
Angles and triangles,
60 degrees angle.
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Proposed Problem 43.
Angles and triangles. |
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Proposed Problem 42.
Angles and triangles,
60 degrees angle. |
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Animated
illustration of the celebrated Morley's angle trisector theorem,
60 degrees angle, equilateral
triangle. |
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Morley's Triangle & Center: Trisection of angles. |
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Problem 50.
Triangle with Equilateral triangles,
60 degrees angle. |
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Proposed Problem 40.
Triangle, Incenter, Excenter, Angles 80, 40, Distances. Angle bisector,
60 degrees angle. |
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