Perhaps it could be Pythagoras and his theorem about right angle triangles
Analyical geometry
Yes - geometry is a branch of mathematics.
yes.
a branch of mathematics in which theorems on geometry are proved through logical reasoning
Geometry
Geometry.
Geometry.
Trigonometry is a branch of geometry which is primarily concerned with the properties and measurement of triangles.
Yes, the word 'geometry' is a noun, a word for a branch of mathematics; a word for a thing.
Euclid discovered the circle and he named his geometry "Euclidean geometry "
Geometry
analytical geometry