Quadratic Curves ( Conics )
There are the curve which appears when cone
is cut in the plane which doesn't contain
a vertex with rigth circular cone.
We knows these conics by names found in Apollonius (BC 247?-205?).
Famous Theorems in Plane Geometry
When it was the 19th century, the geometrical
nature of Conics was researched as the development
of projective geometry.The followings are
intimate relations of conics.