4) What is the shape of surface if a right circular cone is cut by a plane making a smaller angle with the axis, (i.e the plane is not parallel to the slant lined passes through the base)?

5) Which is a practical application of involutes curve?

6) What name the curve traced out by a point on the circumference of a circle that rolls outside another circle of larger diameter?

7) What is set of points on the major axis at equidistant from centre to create the curve of ellipse?

8) What is the term for double ordinate that passes through the focus?