I'm going to show you quickly another way to do this: (but still, the pen tool is essential in PS!)
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Use two guidelines vertical and two horizontal with the same width
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Use the elliptical marquee tool and go to the top left intersection.
Press SHIFT and hold. Pull to the bottom right. Holding the shift key will constrain the proportions of the selection.
You've got now a perfect circle.
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Still with the elliptical marquee tool go the the intersection below.
Press and hold ALT and drag to the bottom right. Here you'll have to aim a bit because pressing ALT will not constrain the proportions. (Pressing ALT and holding will substract from the existing selection.
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Press CTRL+J to place the selection on his own layer.
You can now go on with filling it with your color, duplicate it the way I've told you in this thread.
When done add a layer mask and with a hard brush, brush away the opening in the circle.
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I tried to explain it as simple as I could. I hope it makes sense.
Good luck.
