Media Summary: 1 triangle + 2 parallel lines + 4 circumcenters = ??? How to prove? Source: Antonio Gutierrez. Link: What is the sum of the red and blue angles (soon to appear)? Why does this sum ... Interesting phenomenon that occurs in any square! Why is this? (Source: Antonio Gutierrez) ...
Gogeometry Action 107 - Detailed Analysis & Overview
1 triangle + 2 parallel lines + 4 circumcenters = ??? How to prove? Source: Antonio Gutierrez. Link: What is the sum of the red and blue angles (soon to appear)? Why does this sum ... Interesting phenomenon that occurs in any square! Why is this? (Source: Antonio Gutierrez) ... Triangle incircle phenomenon: How can we prove the segments congruent (at the end)? Source: Antonio Gutierrez. Context here = 2 concentric circles. Easy to see. How easy to prove? (Source: Antonio ... An unusual (not often seen) sufficient condition that guarantees a quadrilateral to be a parallelogram. How to prove? Source: ...
