Bézier curves are used to model smooth curves that can be scaled
indefinitely. Generally, the user selects two endpoints and one or two control
points. A Bézier curve with one control point is called a quadratic Bézier curve
and the kind with two control points is called cubic.
The following example creates a quadratic Bézier curve, where A and C are the
start and end points, B is the control point:
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