Keywords triangles, properties, types, equilateral, isosceles, scalene, congruency, area, Pythagorean theorem, right triangle, mathematics, architecture, engineering Email us at footage@avgeeks ...

The Pythagorean Theorem is at least 2,500 years old, but we keep finding new ways to prove it. ... the Isosceles Lemma and the Right-Angled Lemma. I checked it out, ...