Dimensions of cone with smallest volume that can hold a cylinder

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SUMMARY

The discussion focuses on determining the dimensions of a cone that can enclose a cylinder with a height of 45mm and a radius of 12mm, while minimizing the cone's volume. The volume of the cylinder is calculated to be 20,357mm3. The final dimensions of the cone that achieve the smallest volume are established as a radius of 18mm and a height of 135mm. Detailed calculations and methodologies for deriving these dimensions are requested for clarity.

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  • Study the derivation of the volume formula for cones: v=1/3(pi)r2h.
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chung963
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Homework Statement


A cylinder of height 45mm and radius 12mm is placed inside a circular cone.
What are the dimensions of the cone with the smallest volume to enclose this cylinder


Homework Equations


v=1/3(pi)r^2h
v=(pi)r^2h
SA=2(pi)rh

The Attempt at a Solution


I substuted values into the cylinder equation and got 20,357mm^2 volume of cylinder and made an equation in terms of h and substitued into the cone formula but answer didnt work out.
Final answer is r=18 and h=135
 
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Please post your detailed calculations. Generic descriptions of what you tried aren't very helpful.
 

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