Search All of the Math Forum:

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

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

Topic: How we get a Ellipse from a Conic, and how we get a Oval from
Cylinder Sections-- knifes that are V and asymmetrical V shaped

Replies: 27   Last Post: Oct 8, 2017 12:41 AM

 Messages: [ Previous | Next ]
 Me Posts: 1,716 Registered: 1/23/16
Re: 1)Gottingen's Dorothea Bahns, Laurent Bartholdi, are you as dumb
stupid and messy about Conics as Franz? Oval is the conic section, never ellipse

Posted: Oct 6, 2017 3:11 PM

On Friday, October 6, 2017 at 10:43:35 AM UTC+2, Archimedes Plutonium wrote:

Ellipse:

> c_1X^2 + c_2Y^2 - 1 = 0

Right, Archie.

Sometimes you will find it written the following way:

x^2/a^2 + y^2/b^2 = 1 .

"The shape parameters a, b are called the semi major axis and semi minor axis."

Hint: "It follows from the equation that the ellipse is symmetric with respect to both of the coordinate axes and hence symmetric with respect to the origin."

Source: Wikipedia