From research about conical cutting sector. Lessons in geometry in grade 4, found that curves from the cut surfaces with a flat-plane or phiokruai, also known as "sector, cut a cone" formed a front area. Create a graph shaped parabola, circle, oval, haiphoebola learn about the characteristics of the graph. The equations of each graph. There are real, the result of the equation are real numbers. By the Group caused suspicion that if a complex number is still in the original form of the equations of conical cutting sector and original features of the graph or not the cone-cutting sector.