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Triangles
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Demonstrations 101  120 of 464
The Sum of the Sines of a Sum and Difference of Two Angles
NinePoint Circle in the Complex Plane
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
Rotating Polygons
nSectors of the Angles of a Triangle
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