How to go about making circles with collisions?

Processing Coding Questions
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I want to make a projectile that is a sphere in a 2d game I am creating. I want to make it have a hitbox, is there a way to do it where the hitbox is smooth, rather than being a bunch of smaller rectangles?

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I found this: https://processing.org/examples/circlecollision.html

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See also:

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