A circular cylinder of tantalum with an initial diameter of 3.1 mm is fired at a target. During impact, the base of the cylinder squashes out, producing the deformed shape shown in the figures below(3.5X4.2 mm. Estimate the true strain epsilon(zz) at the base of the cylinder, where z is oriented along the cylinder axis. You can assume that the deformation is approximately volume conserving. Express your answer in the form y.yy