How do you create a disk from a circle or ellipse?

Supreme Blorgon shared this question 5 years ago
Needs Answer

This is driving me absolutely batty. I've searched high and low and Google has turned up nothing. All I want to do is either create a point on the surface of a cone where a line passes through it, or create a surface from an ellipse so that I can get the points where the ellipse intersects the cone using the surface intersect tool. But neither are apparently possible in Geogebra?


What am I missing?

Comments (5)

photo
1

Hi, I'm not sure I understood what you want

photo
1

I have part of an ellipse passing through a cone, and I need to be able to place a point on the two places where the ellipse intersects the surface of the cone. I can't figure out how to do this.

Here is an image of what I made. I need the points where the red line crosses the dark grey cylinder (which is actually an extremely long cone):

fa8146c961

photo
1

Please post your .ggb file so we can check

photo
1

Nothing happens when using the intersect tool at the points where these two objects intersect. I've also tried using the intersect command, and that throws the error "Illegal Argument"

photo
1

hello

d'accord

you can try CAS but the plot is not interest

/wGtCz+IyZyMtQAAAABJRU5ErkJggg==

GG CAS and wolframalfa return same value

/6CxfIslVjjcAAAAASUVORK5CYII=

but certanly intersect of surface does not work for a cone in sphere

try to intersect cone and sphere in attached


saludos

Files: foro.ggb
© 2021 International GeoGebra Institute