Try using the <pen down> block then using the motion blocks to move where you want to draw.
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Yeah! Have a look at my project Pattern Maker. Set the Degrees variable to about 15, and it'll create a spiral!
By the way, here's the link to my Pattern Maker. http://scratch.mit.edu/projects/Guinea_Pig_Girl/1329600

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on a different note to make a perfect circle of square, hold shift while drawing a circle or rectangle.
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