How to Draw a Curved Line on Your PowerPoint 2007 Slide
PowerPoint has a Curve Shape tool that lets you draw curved lines or shapes on your PowerPoint slides. With the PowerPoint Curve Shape tool you can produce lines and shapes. Here is the procedure for drawing a curved line or shape:
Click Shapes group on the Insert tab, then select the Curve shape tool from the Shapes gallery.
The cursor changes to a cross-hair pointer.
Click where you want the curved line or shape to begin.
Your curve can go up or down, left or right.
Click where you want the first turn in the curve to appear.
The straight line turns to a curved line, bent around the point where you clicked. As you move the mouse, the bend of the curve changes. Each time you click, a new bend is added to the line. Keep clicking until the line is as twisty as you want.
Double-click where you the end curved line to end.
To create a closed shape, double-click over the starting point.