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Note :
p is an irrational number
and hence may be expressed as an infinite non repeating decimal
number. On a calculator, the p button gives p rounded off usually
8 to10 significant digits and displaying : p
= 3.1415927 .....
(IV) A mil, is used in military science is defined as the
measure of the central angle subtended by an arc of a circle equal
to 
of its circumference. The name is derived from the fact that, approximately
1 mil = 
Since 6400 mils = 3600, 1 mil = 
and 10 = 
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