PowerPoint provides four line drawing tools: line, curve, freeform, and scribble. You have already explored the Line and Curve tools, and in this tutorial you will learn how you can use the Freeform tool to create lines that can be drawn with more creative freedom — in fact the Freeform tool lets you draw anything almost like drawing with a pencil on a piece of paper. In addition, you can create straight lines as well.
Learn how to draw with the Freeform line tool in PowerPoint 2010 for Windows.

