It was Descartes.
Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few
A man who has something to do with triangles could be a geometry teacher, a musician in an orchestra, of a road sign maker. You may also be thinking of Pythagoras who invented the pythagorean theorum (A^2+B^2=C^2).
From an Arab mathematician called Al-jibra, or something very similar!
Ecluid was a Greek mathematician who was also known as "The father of Geometry." He also wrote books on spherical geometry, conic sections, rigor, perspective and number theory. His name meant 'Good Glory' in Greek. Euclid also deciphered many theories and elements in science.
Knife edge geometry refers to the shape of the cutting edges and the relief behind it. The three main types are Hollow, Taper and Flat..the name refers to the shape of the grinds which makes up the edge geometry.
Please ask the question again. This time, include the name of the mathematician.
Pythagoras.
Leonardo Fibonacci
Solid Geometry
The French physicist and mathematician Blaise Pascal had two known sisters who were named Jacqueline and Gilberte. He was the youngest of the three.
Marin