1) when the focus is on the x axis, the standard equation is: X 2/A 2+Y 2/B 2 = 1.

(a & gtb & gt0)

a^2-b^2=c^2

C refers to half the distance between two focal points, B refers to half the distance between two intersection points of an ellipse and the Y axis, and A refers to the distance between the focal point and the endpoint on the Y axis.

2) When the focus is on the Y axis, the standard equation is: X 2/B 2+Y 2/A 2 = 1.

(b & gta & gt0)

C refers to half the distance between two focal points, A refers to half the distance between two intersection points of an ellipse and the X axis, and A refers to the distance between the focal point and the endpoint on the X axis.