Tangent Lines and Dynamic Trim The 2-Tangent Line allows you to easily sketch lines tangent to 2 entities. The Dynamic Trim tool allows you to remove unwanted portions of sketched entities.  A freehand curve is dragged through the sketch, and any entities intersected by it will be deleted.

1. Continue the sketch as shown in the following figure:

• Click the black arrow on the Line Types Flyout  in the sketcher toolbar and select 2-Tangent Line .
• Allowing the cursor to snap to the circles, sketch two horizontal lines as shown.

Sketching Lines

2. Click Dynamic Trim from the sketcher toolbar.
• Place the cursor inside one of the circles.
• Click and hold the left mouse button, and then drag a freehand curve through the inner arcs to remove them (any entities intersected by the freehand curve will be deleted).

Trimming Completed

	Click Undo and use Dynamic Trim again if necessary.