Athree-point bending test is performed on a glass specimen having a rectangular cross section of height d = 5.5 mm (0.22 in.) and width b = 10 mm (0.39 in.); the distance between support points is 48 mm (1.89 part 1 did you check your mathematics? did you use a consistent set of units? did you use the correct formula for flexural strength? did you use the formula for a rectangular cross section? did you use a consistent set of units? if you are having difficulty with this problem, you may wish to review: solving equations compute the flexural strength if the load at fracture is 287 n (65 lbf).