Lūi-pia̍t:Îⁿ-chui khiok-sòaⁿ

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Wikimedia Commons téng ê siong-koan tóng-àn: Conic sections

Tī lūi-pia̍t "Îⁿ-chui khiok-sòaⁿ" ê ia̍h

Ē-kha 3 ia̍h sio̍k tī chit ê lūi-pia̍t, lóng-chóng ū 3 ia̍h.