Can every tree with total length $2$ be covered by a semi-disc of radius $1$?
If the tree is actually a curve, or the convex hull of the tree is a triangle, I know this is correct after some attempts. But for the general case, I have no idea.
2026-03-29 12:31:52.1774787512
Can every tree with total length $2$ be covered by a semi-disc of radius $1$?
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