Silly question?

If i join up some vertices, is there any way to change this wire model into a solid object? I know about switching views, but thats not what im after.

If you join 3 or 4 vertices into a triangle or quad then press F-Key, you’ll fill them with a Face.

What my problem was that i was modeling using lines from a circle mesh but could not change them all into an object. So with this method i should be able to make an object that renders yes?