Maxima & Minima: Inscribing Cylinder in Sphere of Radius R

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SUMMARY

The discussion focuses on maximizing the surface area of a cylinder inscribed within a sphere of radius R. To solve this problem, one must establish the relationship between the cylinder's radius and height using the Pythagorean theorem. By expressing the surface area of the cylinder as a function of a single variable, either the radius or the height, one can then apply calculus techniques to find the maximum surface area. Visualizing the problem with a diagram of the sphere and cylinder aids in understanding the geometric relationships involved.

PREREQUISITES
  • Understanding of maxima and minima in calculus
  • Familiarity with the Pythagorean theorem
  • Basic knowledge of surface area formulas for cylinders
  • Ability to graph functions and interpret geometric relationships
NEXT STEPS
  • Learn how to derive surface area formulas for geometric shapes
  • Study optimization techniques in calculus, specifically for functions of one variable
  • Explore applications of the Pythagorean theorem in three-dimensional geometry
  • Practice solving similar problems involving inscribed shapes and optimization
USEFUL FOR

Students studying calculus, geometry enthusiasts, and anyone interested in optimization problems involving three-dimensional shapes.

rishiraj20006
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How would we find the maximum surface area of a cylinder inscribed in a sphere of radius R. This problem is given in my textbook . I know concept of maxima and minima will be apllicable here but i can,t start and make the expression of surface area in a suitable manner. Anybody having answers
 
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Start by determining what will be the relation (equation) between the radius of the cylinder and it's lenght, given that it is inscribed in the sphere. With that you can write the equation of the area of the cylinder as a function of 1 variable only (radius or lenght), and solve for the max.
 
First draw a picture! Your picture should be of a circle (the sphere seen from the side) with a rectangle (the cylinder) inside it. If you set up a coordinate system with (0,0) at the center of the circle, you should be able to find either of h and r of the cylinder as a function of the other. (The Pythagorean theorem is helpful here.)
 

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