Surface of Revolution: Find Equation & Identify Surface

  • Context: MHB 
  • Thread starter Thread starter Fernando Revilla
  • Start date Start date
  • Tags Tags
    Revolution Surface
Click For Summary
SUMMARY

The equation of the surface of revolution formed by revolving the curve defined by the equation \(y^2 + z^2 + 2y = 0\) about the y-axis is identified as a sphere. This curve can be rewritten as \((y + 1)^2 + z^2 = 1\), representing a circle centered at \((0, -1, 0)\) with a radius of 1. Consequently, the resulting surface is described by the equation \(E \equiv x^2 + (y + 1)^2 + z^2 = 1\).

PREREQUISITES
  • Understanding of surface equations in three-dimensional geometry
  • Knowledge of the concept of surfaces of revolution
  • Familiarity with the Cartesian coordinate system
  • Basic algebraic manipulation of equations
NEXT STEPS
  • Study the properties of surfaces of revolution in 3D geometry
  • Learn about the derivation of equations for various geometric shapes
  • Explore applications of spherical coordinates in mathematical modeling
  • Investigate the relationship between curves and their surfaces in calculus
USEFUL FOR

Mathematicians, geometry enthusiasts, students studying calculus and three-dimensional geometry, and educators looking to enhance their understanding of surfaces of revolution.

Fernando Revilla
Gold Member
MHB
Messages
631
Reaction score
0
I quote a question from Yahoo! Answers

Find the equation of the surface of revolution when y^2+z^2+2y=0 is revolved about y-axis. Identify the surface of revolution.

I have given a link to the topic there so the OP can see my response.
 
Physics news on Phys.org
We can express $y^2+z^2+2y=0 $ as $(y+1)^2+z^2=1$, so $\gamma\equiv y^2+z^2+2y=0,x=0$ is a circle with center $(0,-1,0)$, radius $1$, and revolving about one of its diameters. As a consquence, the corresponding surface is the sphere $E\equiv x^2+(y+1)^2+z^2=1$.
 

Similar threads

  • · Replies 30 ·
2
Replies
30
Views
3K
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
6
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K