When the plane is cut perpendicular to the cone axis, the shape of the intersection line is (); when the plane is cut parallel to the cone axis, the shape of the intersection line is () When the plane cuts perpendicular to the cone axis, the shape of the intersection line is (); when the plane cuts parallel to the cone axis, the shape of the intersection line is (); when the plane cuts through the cone vertex, the shape of the intersection line is ()

When the plane is cut perpendicular to the cone axis, the shape of the intersection line is (); when the plane is cut parallel to the cone axis, the shape of the intersection line is () When the plane cuts perpendicular to the cone axis, the shape of the intersection line is (); when the plane cuts parallel to the cone axis, the shape of the intersection line is (); when the plane cuts through the cone vertex, the shape of the intersection line is ()

When the plane is cut perpendicular to the cone axis, the shape of the intersection line is (circle); when the plane is cut parallel to the cone axis, the shape of the intersection line is (hyperbola); when the plane cuts the cone through the cone vertex, the shape of the intersection line is (cross line)