Optimizing Volume of Inscribed Cylinder in Cone

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SUMMARY

The problem involves optimizing the volume of a right circular cylinder inscribed in a cone with height h and base radius r. The volume of the cone is given by the formula Vcone = (1/3)(π)(r²)(h), while the volume of the cylinder is Vcylinder = (π)(r²)(h). To find the maximum volume of the cylinder, one must relate the height of the cylinder to its base radius, which requires establishing a relationship between the dimensions of the cone and the cylinder through geometric principles.

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  • Understanding of geometric shapes, specifically cones and cylinders.
  • Familiarity with volume formulas for cones and cylinders.
  • Basic knowledge of optimization techniques in calculus.
  • Ability to interpret and create geometric sketches for visualizing problems.
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  • Learn how to derive relationships between geometric dimensions using similar triangles.
  • Study optimization techniques in calculus, particularly the method of Lagrange multipliers.
  • Explore the application of derivatives to find maximum and minimum values of functions.
  • Investigate geometric interpretations of volume optimization problems in calculus.
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Students studying calculus, particularly those focusing on optimization problems, as well as educators seeking to enhance their teaching methods in geometry and volume calculations.

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Homework Statement


A right circular cylinder is inscribed in a cone with height h and base radius r. Find the largest possible volume of such a cylinder.


Homework Equations


Vcone = (1/3)(pi)(r2)(h)

Vcylinder = (pi)(r2)(h)


The Attempt at a Solution


I've been trying to relate the height of the cylinder to the base of the cylinder. I'm not having much luck. All the equations I make have way too many variables to be optimized..

Could anyone give me a nudge in the right direction?
 
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theRukus said:

Homework Statement


A right circular cylinder is inscribed in a cone with height h and base radius r. Find the largest possible volume of such a cylinder.


Homework Equations


Vcone = (1/3)(pi)(r2)(h)

Vcylinder = (pi)(r2)(h)


The Attempt at a Solution


I've been trying to relate the height of the cylinder to the base of the cylinder. I'm not having much luck. All the equations I make have way too many variables to be optimized..

Could anyone give me a nudge in the right direction?

Draw a 2-d sketch of the vertical cross-section of the cone (should look like a triangle). If the center of the base is at the origin, the tip of the cone is at (0, h), and the righthand corner is at (r, 0). You should be able to get the equation of the line between these two points.
 

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