题目四边形ABCDABCDABCD和四边形A1B1C1D1A_{1}B_{1}C_{1}D_{1}A1B1C1D1是位似图形,点AAA与点A1A_{1}A1对应,点BBB与点B1B_{1}B1对应,点OOO是位似中心,如果OA:OA1=1:3OA:OA_{1}=1:3OA:OA1=1:3,AB=2AB=2AB=2,那么A1B1=______.A_{1}B_{1}=\_\_\_\_\_\_.A1B1=______.知识点：位似变换章节：图形的变化 / 图形的相似
