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Demonstrations 141  160 of 494
How Far Can One See from a Height?
A Generalization of Cross's Theorem
The Spiral of Theodorus
A 2011 IMO Tangency Problem
Ratio of Areas in a Square
Generalized Pythagoras Theorem
The Centroid, Circumcenter, and Orthocenter Are Collinear
Complex Product and Quotient Using Similar Triangles
Triangle Calculator
Sliding to the Fermat Point
Rotating Polygons
nSectors of the Angles of a Triangle
Approximate Area and Circumference of a Circle Using Isosceles Triangles
Thales's Theorem: A VectorBased Proof
ConstantSum Figures
Four Lines and Four Circumcircles
The Malfatti Squares
Ball Bearings
Twin and Nearly Twin Pythagorean Triples
The Fuhrmann Circle
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