By definition, the sum of the distances from a moving point to two fixed points is a constant value. 2a is the major axis, 2b is the minor axis, and 2c is the focal length.

Party A = Party B+Party C. Eccentricity e = c/a

Eccentricity should be less than 1 and greater than 0.

hyperbola

By definition, the difference between the distance of a moving point and two fixed points is a constant value. 2a is the major axis, 2b is the minor axis, and 2c is the focal length.

Square of c = square of b+square of a.

Eccentricity e = c/a

Eccentricity is greater than 1.

The hyperbolic asymptote equation is y =+-b/a.

x

That's all you often take.