- #1
robertdeniro
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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