Question

Distance between focus and directrix of a parabola

Answer 1

Answer:

Any point (x0,y0) on the parabola satisfies the definition of calculate :

Distance between the point on the focus . Distance between the point on the parabola to the directrix

Answer 2

Answer:

2a.

distance of focus from center is a

distance if directrix from center is a

so a+a=2a