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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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Intouch and Extouch Triangles, Areas
Contact Triangles Areas, Incircle, Excircle
Contact Triangles Areas, Incircle, Excircle, Inradius, Exradius
Area of the Contact Triangle, inradius, circumradius
Mascheroni Construction with compass alone.
Right Triangles, Formulas and Facts
Mind Map of the Pythagorean Theorem Proofs by shears, translation, similarity. Facts.
Triangle and Squares 20
Last updated: March 20, 2008
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