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उस परवलय का समीकरण ज्ञात कीजिए जिसका शीर्ष मूल बिन्दु पर तथा `y + 3=0` जिसका नियता हो | इसकी नाभि भी ज्ञात कीजिए |

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माना परबलय के शीर्ष O(0. 0) हे।
`y + 3 = 0 " "rArr" " y = - 3`
`therefore` नियता -अक्ष के नोचे 3 मात्रक की दूरी पर -अक्ष के समान्तर एक रेखा है
एवं परवलय की नाभि अक्ष पर स्थित है, इसलिए नाभि F (0,3 ) हैं।
अतः परवलय का समीकरण `x^(2) = 4ay`
जहाँ `" " a = 3`
`rArr" " x^(2) = 4xx 3y = 12y`
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