Question: Shading

Hello all, I'm having a lot of trouble using the shading function. I'm trying to shade a circle a particular color but there is always an error. I found this website but I didn't figure out how to do it myself: http://www.indiana.edu/~statmath/math/maple/plotting/index.html I'm making a picture of a cartoon and my plots are all finished but the shading part is throwing me off; when I put in filled=true instead of filling the circle it makes a box the size of the radius on top of the circle. Can anyone help me?
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