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Geometry
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Demonstrations 141  160 of 3202
Two Equidecomposable Triangles
Parallelepiped with Edges on Three Skew Lines
Spherical Right Triangles
Spherical Cap and Ring
Intersection of a Plane and a Tetrahedron
Completing a Tetrahedron to a Parallelepiped
Dissection of a Spherical Triangle into Three Spherical Triangles around a Spherical Hexagon
Four Theorems on Spherical Triangles
Dissection of Three Regular Spherical Pentagons into Five Equilateral Spherical Triangles
Dissection of a Spherical Equilateral Triangle into Three Isosceles Triangles
Relations between Plane Angles and Solid Angles in a Trihedron
Supplementary Solid Angles for Trihedron
SwingandTwist Hinged Dissection of One Regular Heptagon into Seven
Regular Spherical Polygons
Regular Tetrahedra Formed by Lattice Points Equidistant from the Origin
Convergent Series of Rectangles to Fill a Unit Square
Joukowski Airfoil: Geometry
Euclid's Formula and Properties of Pythagorean Triples
Tracing a Cyclogon: Roulette of a Polygon Rolling along a Line
Tracing a Peritrochoid
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