When a bar with the hexagonal cross section shown in Fig. (a) is subjected to a torque T, numerical analysis shows that the maximum shear stress in the bar is Tmax = 5.7T/c. Determine the percentage loss in strength that results when a circu- lar bar of diameter d is machined into the hexagonal shape shown in Fig. (b). Location of Tmax- (a) FIG. P3.53 (b)