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Can elliptic arc (defined as part of an ellipse, with extent not greater than $90˚$) be represented by quadratic Bezier curve?

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I would call that an "elliptical arc". An elliptic curve is something completely different. –  Rahul Nov 25 '10 at 4:26
@Rahul Narain - Thanks! –  Rogach Nov 25 '10 at 4:29
A rational quadratic, yes, but I'm pretty sure not a quadratic... –  J. M. is back. Nov 25 '10 at 4:30
Also, quadratic Bézier curves can only represent parabolas. To represent elliptical arcs and other cubic sections exactly, you need rational functions, as J.M. mentioned in your previous question. –  Rahul Nov 25 '10 at 4:33

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