Illustrator is both iPhone and iPad Vector drawing app. If you want to draw circle, just draw circle with your finger. If you want a rectangle - draw a rectangle. Illustrator’s intelligent algorithm recognizes a few shapes and draws an accurate version of them.
Illustrator 1.8 ($9.99)
http://itunes.apple.com/us/app/illustrator/id400293407?ls=1&mt=8
Illustrator Lite 1.8 (FREE*)
http://itunes.apple.com/us/app/illustrator-lite/id416235244?ls=1&mt=8
*Lite version allows you to draw 5 figures only to test the interface.
Illustrator 1.8 ($9.99)
http://itunes.apple.com/us/app/illustrator/id400293407?ls=1&mt=8
Illustrator Lite 1.8 (FREE*)
http://itunes.apple.com/us/app/illustrator-lite/id416235244?ls=1&mt=8
*Lite version allows you to draw 5 figures only to test the interface.

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