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Triangles
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Demonstrations 121  140 of 455
Trisectors and Circumcircles
Pompeļu's Theorem
Equal Incircles along a Line
The Medians of a Triangle Are Concurrent: A Visual Proof
The Centroid of a Triangle Divides Each Median in the Ratio 1:2
Simson's Line
Twins of Arbelos and Circles of a Triangle
A Necklace of Equilaterals
Another Generalization of Pythagoras's Theorem
The Intersection of Two Triangles
Area of Triangles Formed by Tangents on the Reciprocal Curve
The Triangles Formed by the Endpoints and Midpoints of Cevians
SideSplitting Triangle Ratios
Largest Square inside a Triangle
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
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