题目

已知在Rt△ABC中,斜边AB=2BC,以直线AC为对称轴,点B的对称点是B',如图所示,则与线段BC相等的线段是____，与线段AB相等的线段是_______和_______,与∠B相等的角是________和_______,因此可得到∠B=________. 答案：【答案】 B′ C AB′ BB ′ ∠B′ ∠BAB′ 60°【解析】∵以直线AC为对称轴,点B的对称点是B' ，∴B′C=BC ， ∠B′CA=∠BCA=90°，AB′=AB=2BC，∴AB′=AB=BB′，∴∠B′=∠B=∠B′AB =60°.Tom's worry is he won't be chosen for the school football team．A． that B．whether C． when D． why