The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » sci.math.* » sci.math

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Conic eccentricity through five points
Replies: 8   Last Post: Jul 22, 2013 2:08 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Wally W.

Posts: 283
Registered: 6/15/11
Re: Conic eccentricity through five points
Posted: Jun 7, 2013 7:14 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Thu, 6 Jun 2013 06:20:30 -0700 (PDT), Narasimham wrote:

>Find eccentricity of a conic in terms of 5 points (x1,y1) to (x5,y5).( as there are 5 constants in a x^2 + 2 h x y + b y^2 + 2 f x + 2 g y = 1 )

Five equations with five unknowns. The constants can be found.

Then I would go here:

Starts with an equation similar to yours, with F = -1.

Last section:
Identifying rotated conic sections

Convert the equation to the standard form of the known shape, and plug
values into the equation for eccentricity.

It seems that it would be very tedious with many opportunities for
error, but doable.

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.