File:Right Angle Triangle.svg - Wikipedia

Illustration of the horizontal coordinate system. The observer is

File:Right Angled Triangle in Assamese.svg - Wikimedia Commons

File:Triangle Sides ABC.svg - Wikipedia

Euler diagram of types of triangles, using the definition that

File:Triangle-law edit with 3 heights, acute.svg - Wikimedia Commons

File:Basic right triangle b.svg - Wikimedia Commons

File:Isosceles right triangle with legs length 1.svg - Wikipedia

File:Isosceles right triangle-01.svg - Wikimedia Commons

File:Angles in Triangles Example 5.svg - Wikibooks, open books for

File:Triangle.svg - Simple English Wikipedia, the free encyclopedia

File:Right triangle centroid.svg - Wikimedia Commons

File:Right triangle ABC.svg - Wikimedia Commons

Maslow and the biased pyramid - by Srikanth Ramanujam