How to Extrude 2D angular patterned Array object in to 3D model in Autocad 2015?

Before you get started make sure that your work-space is set to3D modeling and to work with Extrude command you have to have closed poly line or circle or rectangular, NO straight line or any thing that's not closed object.

from home tab , select Extrude Command , select the object you want to extrude, specify the height.