I x W x i x I y ( c m 4 ) ( c m 3 ) ( c m ) ( c m 4 ) # # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # #a # # # # # # # # # # # # # # # # # # # #b # # # # # # # # # # # # # # # # # # # #a # # # # # # # # # # # # # # # # # # # #b # # #