(2013•乐清市模拟)如图,等腰Rt△ABO的斜边OB在x轴上,O是坐标原点,点A在第一象限内,BO=2,点C(t,0

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  • (1)证明:连结AD,如图,∵△OAB为等腰直角三角形,∴OA=OB,∠AOB=∠ABO=45°,∴∠AOD=45°,在△AOD和△ABC中,∠ADO=∠ACB∠AOD=∠ABCAO=AB,∴△AOD≌△ABC(AAS),∴OD=BC;(2)∵BO=2,点C坐标为(t,...