The given equation of parabola is $y^2$ = 12x which is of the form $y^2$ = 4ax. ∴ 4a = 12 ⇒ a = 3 ∴ Coordinates of focus are (3, 0) Axis of parabola is y = 0 Equation of the directrix is x = –3 ⇒ x + 3 = 0 Length of latus rectum = 4 × 3 = 12.