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`x^(2)=-9y` |
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Answer» Given equation `x^(2)=-9y` Comparing with `x^(2)=-4ay`, `4a=9" "rArr" "a=(9)/(4)` Coordinates of focus `-=(0,-a)-=(0,-(9)/(4))` Axis of parabola : x=0 Equation of directrix : y-a=0 `rArr" "y-(9)/(4)=0` `rArr" "4y-9=0` Length of latus rectum =4a=9 |
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