Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....size of the hole in a doughnut chart. using ( Presentation pres =...new Presentation ()) { IChart chart = pres . Slides [ 0 ]. Shapes...