Assertion: bézier curve | /r/CapableOf | approximate circle
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text: Some curves that seem simple, such as the circle, cannot be described exactly by a Bézier or piecewise Bézier curve; though a four-piece cubic Bézier curve can approximate a circle (see composite Bézier curve), with a maximum radial error of less than one part in a thousand, when each inner control point (or offline point) is the distance 4 ( 2 − 1 ) 3 {\displaystyle \textstyle {