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Triangles
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The Excentral Triangle and a Related HexagonFour Concyclic PointsCross's TheoremA Concurrency from Midpoints of Arcs of the CircumcircleA Concurrency of Lines through Points of Tangency with Excircles
The Excentral Triangle and a Related Hexagon
Updated this month
Four Concyclic Points
Updated this month
Cross's Theorem
Updated this month
A Concurrency from Midpoints of Arcs of the Circumcircle
Updated this month
A Concurrency of Lines through Points of Tangency with Excircles
Updated this month
Equilateral Triangles in 3D with Integer CoordinatesArbitrary Curves of Constant WidthSpherical Triangle SolutionsA Concurrency from Six Pedal PointsDissecting an Equilateral Triangle into Four Equilateral Triangles
Equilateral Triangles in 3D with Integer Coordinates
Updated this month
Arbitrary Curves of Constant Width
Spherical Triangle Solutions
A Concurrency from Six Pedal Points
Dissecting an Equilateral Triangle into Four Equilateral Triangles
Garfield's Proof of the Pythagorean TheoremDudeney's Proof of the Pythagorean TheoremSum of Medians Divided by the PerimeterPrimitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's FormulaCylinder Area Paradox
Garfield's Proof of the Pythagorean Theorem
Dudeney's Proof of the Pythagorean Theorem
Sum of Medians Divided by the Perimeter
Primitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's Formula
Cylinder Area Paradox
Angle and Length Measurement of a PolygonNine-Point CircleParallelogram Dissection ParadoxSine, Cosine, and Tangent Using Ratios of Sides of a Right-Angled TriangleSquare Pyramid and Its Right Triangles
Angle and Length Measurement of a Polygon
Nine-Point Circle
Parallelogram Dissection Paradox
Sine, Cosine, and Tangent Using Ratios of Sides of a Right-Angled Triangle
Square Pyramid and Its Right Triangles

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