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Triangles
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Demonstrations 121  140 of 442
Problems on Circles IX: Circumcircles and Incircles of a Triangle
An Angle Bisection
Three Concyclic Sets of Points Associated with the Orthic Triangle
Triangle Side Length Inequality
Drilling a Square Hole
Drilling a Triangular Hole
Boltyanski's Cake Problem
The Area of a Square in a Square
Triangle Area Bisectors
Da Vinci's Proof of the Pythagorean Theorem
How to Torpedo a Ship
Pythagorean Graphs
The Lunes of Hippocrates
Difference Formula for Cosine
How Many Triangles Are There?
Center of an Equilateral Triangle Circumscribing a Given Parabola
Centre d'un triangle équilatéral circonscrit à une parabole (French)
The Sum of the Interior Angles of a Triangle Equals 180 Degrees by Paper Folding
Triangles on a Sphere
The Johnson Circles
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