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How to draw a moon in adobe illustrator
Create a new document.
Go to file] new (or ctrl + n) and set the size of the document to a horizontal letter-sized canvas. Add guides by creating a rectangle using the rectangle tool (w:11 in, h:8.5 in).
Next, drag the guides onto each center of the bounding box. Finish by right clicking over your ruler to change your document measurements to pixels.