The formula of the length of the generatrix of the cone is (generatrix of the cone) 2= (height of the cone) 2+ (radius of the circle at the bottom of the cone) 2. The cone is a geometric figure, the expanded diagram of the cone is a sector, and the generatrix is the radius of this sector. Cone generatrix is an important concept in cone calculation and its properties research. Generally speaking, the generatrix of a straight cone is the radius of the sector used to surround this cone.