Surface Area of of an area - parametric surface

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SUMMARY

The discussion focuses on calculating the surface area of the spherical cap defined by the sphere \(x^{2}+y^{2}+z^{2}=1\) above the cone \(z=\sqrt{x^{2}+y^{2}}\). Participants suggest using cylindrical coordinates for simplification, where the sphere is represented as \(r^{2}+z^{2}=1\) and the cone as \(z=r^{2}\). The integration limits are determined by the intersection of the sphere and cone, leading to a quadratic equation for \(r^{2}\). The conversation emphasizes the importance of correctly setting up the integrals and using appropriate coordinate systems to avoid errors in evaluation.

PREREQUISITES
  • Understanding of surface area integrals in multivariable calculus
  • Familiarity with cylindrical coordinates and their application in integration
  • Knowledge of partial derivatives and their role in surface area calculations
  • Proficiency in solving quadratic equations and understanding their geometric implications
NEXT STEPS
  • Learn how to set up and evaluate integrals in cylindrical coordinates
  • Study the method for finding surface areas of parametric surfaces
  • Explore the use of polar coordinates in double integrals for area calculations
  • Review the relationship between spherical and cylindrical coordinates in calculus
USEFUL FOR

Students and professionals in mathematics, particularly those studying calculus and geometry, as well as engineers and physicists dealing with surface area calculations in three-dimensional space.

  • #31
I got a + sign in there. (-1)^2=(+1). You can still simplify some more.
 
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  • #32
Woops, your right:

A(S) = \int \int \sqrt{\frac{1}{(1-r^{2})} dA
 
  • #33
Ok, now you want to integrate over the values of x and y that will cover the spherical cap. That's a circular region, right? That's a good reason to switch to polar coordinates. What is dA in polar coordinates?
 
  • #34
r^2 sin (phi) dr dtheta dphi
 
  • #35
A is a region in the x-y plane. Use polar coordinates. Not spherical.
 

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