Hello,
Basically I was trying to prove the equation of ellipse by equating the sum of distances from foci to point on ellipse and sum of distances from foci to far left point of ellipse (i.e. > (-a,0)). But that does not seem to work perfectly.
There is an easier way to prove the ellipse equation, which is equate the sum of distances from foci to point on ellipse with 2a. The question I have is where does that 2a come from??
Thanks
Basically I was trying to prove the equation of ellipse by equating the sum of distances from foci to point on ellipse and sum of distances from foci to far left point of ellipse (i.e. > (-a,0)). But that does not seem to work perfectly.
There is an easier way to prove the ellipse equation, which is equate the sum of distances from foci to point on ellipse with 2a. The question I have is where does that 2a come from??
Thanks