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Triangles
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Demonstrations 81  100 of 450
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The Sum of the Sines of a Sum and Difference of Two Angles
NinePoint Circle in the Complex Plane
NonEuclidean Triangle Continuum
The Interior Angles of a Triangle Sum to Pi
ColorChanging Origami Star
Trigonometric Functions for a Right Triangle
Rational Triangles with Area Less than 102
Packing Squares with Triangles
Recursive Exercises V: Nested Triangles
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
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