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Geometry
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Demonstrations 2201  2220 of 3037
Inscribed and Central Angles in a Circle
14Piece Dissection of Juel's Pyramid into a Parallelepiped
Dissecting a Square Pyramid into 15 Pieces
A Net That Folds into an Icosahedron or into a Double Biaugmented Triangular Prism
Triangle Interior
The Triangle Formed by the Centers of the Miquel Circles
Projections of Midpoints onto Circumradii
Zonogons: Minkowski Sums of Line Segments in 2D
The Sum of the Reciprocals of the Exradii
The Product of the Inradius and Three Exradii
The Distance from the Circumcenter to an Excenter
The Product of the Circumradius and an Exradius
Another Relation between the Areas of Triangles Associated with an Excircle
On the Areas of Triangles Associated with an Excircle
The Sum of the Circumradii of Three Subtriangles
The Sum of the Square Roots of the Areas of Three Subtriangles
The Sum of the Perimeters of Three Subtriangles
Van Aubel's Theorem for Triangles
Solving Oblique Triangles
Reflecting a Lattice of Points
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