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Welcome to Theorems and Problems Online Tutoring about triangles. Site created and maintained by Antonio Gutierrez. Level: High School, SAT Prep, College geometry.
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Parallelogram with Squares theorem
Triangle and Squares
Finsler Hadwiger Theorem
Animated Angle to Geometry Study
Proposed problem Right Triangle and Excenter
Proposed problem 20 Right Triangle, incircles and inradii.
Proposed problem 21 Acute triangle, orthocenter, diameter, tangents.
Last updated: December 6, 2007
