如图，已知AB是⊙O的弦，半径OA＝1cm，∠AOB＝120，⊙O上一动点P从A点出发，沿逆时针方向运动一周，当S＝S时，则点P所经过的弧长是
参观广州博物馆对我们很有教育意义．
very educational for us Guangzhou Museum．
你沿丝绸之路旅游过吗？
ever along the Silk Road？
The students are very h ． They clean houses for the old people every weekend．
By reading 30 minutes a day， you can learn more words and i your writing．
N cross the road when the traffic light is red．
，⊙O上一动点P从A点出发，沿逆时针方向运动一周，当S
＝S
时，则点P所经过的弧长是
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