做法有些烦延长A1B1交AB与O AC=8BC=6AB=10因为旋转90°，所以，A1B1⊥ABsin角B1A1C=sinBAC=BC:AB=BO:BA1解得BO=12/5OB1=8/5OB1:BC=AO:AC解得OB1=6/5在RT△A0M中AO^2+OM^2=AM^2AM=更好下41
