两道关于弧长和扇形面积的题 !初三数学 {急!}1.已知扇形的半径为2cm,面积是 4/3派cm²,则扇形的弧长是____cm. 扇形的圆心角为___°.2.如图,扇形纸扇完全打开后,外侧两竹条AB.AC夹角为120°,AB的
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![两道关于弧长和扇形面积的题 !初三数学 {急!}1.已知扇形的半径为2cm,面积是 4/3派cm²,则扇形的弧长是____cm. 扇形的圆心角为___°.2.如图,扇形纸扇完全打开后,外侧两竹条AB.AC夹角为120°,AB的](/uploads/image/z/7019440-16-0.jpg?t=%E4%B8%A4%E9%81%93%E5%85%B3%E4%BA%8E%E5%BC%A7%E9%95%BF%E5%92%8C%E6%89%87%E5%BD%A2%E9%9D%A2%E7%A7%AF%E7%9A%84%E9%A2%98+%21%E5%88%9D%E4%B8%89%E6%95%B0%E5%AD%A6+%7B%E6%80%A5%21%7D1.%E5%B7%B2%E7%9F%A5%E6%89%87%E5%BD%A2%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA2cm%2C%E9%9D%A2%E7%A7%AF%E6%98%AF+4%2F3%E6%B4%BEcm%26%23178%3B%2C%E5%88%99%E6%89%87%E5%BD%A2%E7%9A%84%E5%BC%A7%E9%95%BF%E6%98%AF____cm.+%E6%89%87%E5%BD%A2%E7%9A%84%E5%9C%86%E5%BF%83%E8%A7%92%E4%B8%BA___%C2%B0.2.%E5%A6%82%E5%9B%BE%2C%E6%89%87%E5%BD%A2%E7%BA%B8%E6%89%87%E5%AE%8C%E5%85%A8%E6%89%93%E5%BC%80%E5%90%8E%2C%E5%A4%96%E4%BE%A7%E4%B8%A4%E7%AB%B9%E6%9D%A1AB.AC%E5%A4%B9%E8%A7%92%E4%B8%BA120%C2%B0%2CAB%E7%9A%84)
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