File:Triangle-angles.svg - Wikimedia Commons

File:Right Angle Triangle.svg - Wikipedia

File:Triangle-right-abchpq.svg - Wikimedia Commons

File:Triangle centroid 2.svg - Wikipedia

File:Triangle-exteriour-angle-theorem-2.svg - Wikimedia Commons

File:Hyperbolic-triangle-interior-angles.svg - Wikimedia Commons

Illustration of the horizontal coordinate system. The observer is

File:Basic right triangle.svg - Wikipedia

hyperbolic geometry

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

Vertex angle - Wikiwand