Other Standard Form of Ellipse

If the major axis of the ellipse is along the y-axis, then the equation of the ellipse is

For this type of ellipse,

Centre: C(0, 0)

Vertices: A(0, a), A′(0, −a)

Foci: F₁(0, ae), F₂(0, −ae)

Equation of major axis is x = 0

Equation of minor axis is y = 0

End points of minor axis: B(b, 0), B′(−b, 0)

Equation of directrices: y= ±a/e