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Mathematical logic (basic trigger) in the game, what does this code do?

I am trying to understand what exactly this code does. It's written in Objective-C, but should be familiar to anyone with a C background. What exactly is sinful / cos math doing here? Also, does anyone have any good guidelines for learning triggers for game concepts like these?

for (int i = 0; i < GAME_CIRCLES; i++)
{
    point.x = center.x - sin (degree) * RADIUS;
    point.y = center.y + cos (degree) * RADIUS;
    mPieRect[i] = CGRectMakeWithCenter (point, RADIUS - 4);
    degree += PI / 3.0;
}
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This is a parametric equation for a circle (see wikipedia )

I am assuming that the variable "degree" is actually in radians and not degrees. There are 360 ​​degrees in a circle or 2 * Pi radians.



By advancing the variable of degree Pi / 3, it moves around 1/6 of the circle

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