Logarithmic mean area of the cylindrical tube is given as

1.	Logarithmic mean area of the cylindrical tube is given as
A.	2‚âà√¨‚àö√ër <sub>m</sub>
B.	‚âà√¨‚àö√ër <sub>m</sub>l
C.	2‚âà√¨‚àö√ër <sub>m</sub>l
D.	2r <sub>m</sub>l
Answer» D. 2r <sub>m</sub>l

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Logarithmic mean area of the cylindrical tube is given as

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