The Volume of a 1-Metre iron rod is 1386 cu. CM. Find its Diametre
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volume of a cylinder =πr^2h
1386=22/7*r^2*1
1386*7/22=r^2
63*7=r^2
441=r^2
taking square root
21=r
the radius of rod is 21 m
diameter is twice the radius
d=2r
=2*21
42m
therefore diameter of the rod is 42 metre
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