Surface area of the boundary enclosed by surfaces

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SUMMARY

The discussion focuses on calculating the surface area of the boundary enclosed by the surfaces defined by the equations x² + y² = 9, y + z = 5, and z = 0. The area is determined using the formula A(S) = ∫∫D|ru × rv| dA, where the region D is defined by the intersections of the given surfaces. Participants emphasize the importance of identifying the intersection points of the surfaces to accurately determine the boundaries contributing to the surface area calculation.

PREREQUISITES
  • Understanding of multivariable calculus concepts, particularly surface integrals.
  • Familiarity with parametric equations and vector calculus.
  • Knowledge of cylindrical coordinates and their applications in surface area calculations.
  • Ability to solve systems of equations to find intersection points of surfaces.
NEXT STEPS
  • Study the application of surface integrals in multivariable calculus.
  • Learn how to compute intersections of surfaces in three-dimensional space.
  • Explore cylindrical coordinates and their use in simplifying surface area problems.
  • Practice solving similar problems involving boundaries defined by multiple surfaces.
USEFUL FOR

Students in multivariable calculus, mathematicians working on surface area problems, and educators teaching concepts related to three-dimensional geometry and calculus.

josh28
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Homework Statement


Find the area of the surface that is the boundary of the region enclosed by the surfaces x^{2}+y^{2}=9 and y+z=5 and z=0



Homework Equations


A(S)=\int\int_{D}\left|r_{u}\times r_{v}\right| \; dA


The Attempt at a Solution



I am really confused as to what he means by boundary. Is that the region at the top of the cylinder that is cut by y+z=5? So then the region defined by that would be 16=-x^{2}+y^{2}. From there I think I could find the area.
 
Last edited:
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The equations given enclose a solid region, and you are asked to find the surface area of the solid. You have three surfaces, and each one of them supplies a portion of the boundary (surface area) of the solid region. You need to figure out where the surfaces intersect to know how much of each surface to use.
 

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