Solve Nested Ball Problem: r_big-r_small ≤ d(x,y)

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SUMMARY

The Nested Ball Problem requires proving that the distance between the centers of two balls, represented as d(x,y), is less than or equal to the difference in their radii, r_big - r_small. The solution involves applying the triangle inequality, which shows that d(x,y) ≤ r_big + r_small. A visual representation of the two circles can clarify why the smaller circle cannot be contained within the larger circle when the distance exceeds r_big - r_small.

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  • Understanding of basic geometry concepts, specifically circles.
  • Familiarity with the triangle inequality theorem.
  • Knowledge of mathematical notation for distances and radii.
  • Ability to visualize geometric relationships in a plane.
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  • Explore advanced geometric proofs involving nested shapes.
  • Learn about the properties of circles and their relationships in Euclidean space.
  • Investigate the implications of the triangle inequality in higher dimensions.
  • Study visual proof techniques for geometric theorems.
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Homework Statement


given a ball within another ball
show that the distances between their centers are less than the difference in their radii

Homework Equations





The Attempt at a Solution


let r_big and r_small represent the respective radii and let x and y represent the centers of the big and small balls

i got d(x,y)<=r_big+r_small by triangle inequality but i need r_big-r_small
 
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Did you try and draw two circles in the plane where |x-y|>r_big-r_small and try to figure out why the smaller circle can't be contained in the larger circle? If you can explain that in words, then you are probably halfway there.
 
nm i got it
 
Last edited:

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