The given equation of parabola is x2 = –9y,
which is of the form x2 = –4ay.
∴ 4a = 9 ⇒ a =

9

4

∴ Coordinates of focus are (0,−

9

4

)
Axis of parabola is x = 0
Equation of the directrix is y =

9

4

⇒ 4y - 9 = 0
Length of latus rectum = 4 ×

9

4

= 9.