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Let A(0,-1, 1), B(0, 0, 1), C(1, 0, 1) a...

Let `A(0,-1, 1), B(0, 0, 1), C(1, 0, 1)` are the vertices of a `DeltaABC`. If R and r denotes the circumradius and inradius of `DeltaABC`, then `r/R` has value equal to

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