The kern of a circular cross-section of radius R is a concentric circular area with a radius of

The kern of a circular cross-section of radius R is a concentric circu

1.	The kern of a circular cross-section of radius R is a concentric circular area with a radius of
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

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The kern of a circular cross-section of radius R is a concentric circular area with a radius of

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