How to draw a line with arrowheads at both ends adobe illustrator

1. Draw your line using the pen tool.

2. Open the Window > Stroke panel.

If you don’t see the arrowhead section try toggling the ‘Show Options’ by hitting the little arrow with squiggly lines.

3. Add your arrowheads.

http://luanneseymour.wordpress.com/2012/10/30/creating-arrows-and-arrowheads-in-illustrator-cs6/

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