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Plane Geometry
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Demonstrations 881  900 of 1048
Triangles: Acute, Right, and Obtuse
A Geometrical Theorem of Leibniz
Parallelogram Slide
Double PSlide Dissection
Kelland's GnomontoSquare Dissection
Perigal's ThreeSquarestoOne Dissection
Constructing a Regular Pentagon with Ruler and Compass
Centroid Hexagon
Van Aubel's Theorem for Quadrilaterals
The Perpendicular Bisectors of a Triangle
Designs by Colorful Circles
The Ratio Theorem
The Butterfly Theorem
Intersecting Secants Theorem
Euler's Triangle Formula
Cyclic Quadrilaterals, Subtriangles, and Incenters
Intersecting Chords Theorem
Maurer Roses
Opposite Angles of a Quadrilateral in a Circle
Largest Isosceles Triangle Inscribed in a Circle
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