Acylindrical rod initially has length 3.0 meters and diameter 6.0 cm. due to thermal expansion, this bar expands by the same fractional amount in each direction. specifically, \frac{\delta r}{r}=δ r r = 0.006 . the cross sectional area a of a cylinder is given by: a=\pi\: r^2\: a = π r 2, where rr is the radius of the cylinder. what is the cross sectional area (in inches2 ) of this cylinder after the expansion has occurred ?