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Im trying to make a concave shape, something along the lines of below illustration.

enter image description here

Is there a tutorial on how to build shapes in photoshop, I can create a circle shape using the 'ellipse tool', however, I dont know how to precisely cut the circle to my requirements to create the concave.

Thanks,

Edit: Apologies, I was referring to the concave shape as convex. Corrected.

marked as duplicate by Hanna, Scott, Vincent, JohnB, Brendan May 3 '13 at 12:53

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