Properties
Category
English
Similar Topics
Statistics
Comments
2
Participants
3
Subscribers
3
Votes
3
Views
115
Share
Question about surface of revolution of parabola
Answered
I'm trying to model the parabola y=(x^2)/4, rotated around the yaxis, cut off at the top by the plane y=2. However, the only way I found is to use the paraboloid formula and then for some reason it's sideways from the y axis into z. I'd rather 'rotate' a parabola around y, and the sides go into z, if that makes sense. Is there a way to do that?
 GeoGebra
 Help
 Partners

Contact us
 Feedback & Questions
 This email address is being protected from spambots. You need JavaScript enabled to view it.
 +43 677 6137 2693
© 2020 International GeoGebra Institute
Whithout a sketch or a file with the parabola tyour despcription about y and x and the use of af the top, or sideways the y axis into z etc is not very clear to me. Are you sure about y and z and what you want?
Here's an anexample op a rotation of a parabola with limitid height with the Surface command: Surface(2sqrt(h) cos(t), 2sqrt(h) sin(t), h, h, 0, 2, t, 0°, 360°).If you want the parabola elsewhere you can exchange the expressions for x, y and/or z.
chris
type
f(x)=x^2/4
g(x)=if(f(x)<=2,f(x))
surface(g,2 pi, yAxis)
Comments have been locked on this page!