This application is very good tool for student , engineer and technical people to get all information for the cone to make it by using flat steel , aluminum or copper sheet...etc By this app you can get :- 1- Cone angle as the diameter and height are given. 2- Detailed drawing for the flat sheet needed to make this cone . 3- The area of this flat sheet of the cone. As a great improvement we add the following features 1 - The flat pattern becomes dynamic and real. 2 - Adding sheet thickness.