1.

Let angular value of one graduation of a tube of length x be seconds and R be the radius of its internal curved surface, then

A. <img src="/_files/images/civil-engineering/surveying/54-3.68-1.png">
B. <img src="/_files/images/civil-engineering/surveying/54-3.68-2.png">
C. <img src="/_files/images/civil-engineering/surveying/54-3.68-3.png">
D. <img src="/_files/images/civil-engineering/surveying/54-3.68-4.png">
E. .
Answer» B. <img src="/_files/images/civil-engineering/surveying/54-3.68-2.png">


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