Triangle Interior -- from Wolfram MathWorld

The interior of the triangle is the set of all points inside a triangle, i.e., the set of all points in the convex hull of the triangle

A Triangle Median Meet

Triangle - Wikiwand

How to Get an A in Geometry (with Pictures) - wikiHow

Full article: On a New Property of the Steiner Inellipse

Full article: A Note on the Stammler Hyperbola

Triangle -- from Wolfram MathWorld

sec4_2_problem_11a.jpg

Archimedean Dual -- from Wolfram MathWorld

Circumscribed Circle