Cylindrical shell and cross-section volume concept question

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SUMMARY

The discussion clarifies that when calculating the volume of a solid using either the cylindrical shell method or the cross-section method (also known as the washer method), both approaches yield identical results. The choice between these methods depends on whether one prefers to express x in terms of y or vice versa. This equivalence holds true regardless of the specific equations involved in the volume calculation.

PREREQUISITES
  • Understanding of calculus concepts, particularly volume integration
  • Familiarity with the cylindrical shell method for volume calculation
  • Knowledge of the washer method for cross-sectional volume determination
  • Ability to manipulate equations to express variables in different forms
NEXT STEPS
  • Study the application of the cylindrical shell method in various calculus problems
  • Explore the washer method in depth, focusing on its derivation and applications
  • Practice problems involving volume calculations using both methods for comparison
  • Investigate the implications of variable manipulation in volume integration
USEFUL FOR

Students and educators in calculus, particularly those focusing on volume calculations in solid geometry, as well as anyone looking to deepen their understanding of integration techniques.

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When a problem with a number of equations is given, asking to find its volume, a student has a choice between the cylindrical shell method and the cross-section method. However, regardless of what method is chosen, do both answers end up being EXACTLY the same?
 
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Yes. The "cross-section method" is also known as the washer method. It depends on whether you want to re-express x in terms of y or the reverse to get the volume by either method.
 
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