2) When a cone is cut by a section plane parallel to the profile plane. Its true shape of section is seen is?

3) The study of intersection of surfaces help in?

4) Name the curve of intersection of a vertical cone cut by an auxiliary vertical plane.

5) When a vertical cylinder is penetrated by a horizontal cylinder, the top view of the intersection is?

6) When two prisms are intersected at right angle, the intersection is made up of?