扇环面积如何推导?请看清楚,我问的是扇环,不是扇形,解扇形面积的,免进!书上说是S=π(r1+r2)L,其中r1,r2是是上下底面半径,L是母线长!其实我是想求圆台的侧面积,因为圆台的侧面积是扇环,而
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![扇环面积如何推导?请看清楚,我问的是扇环,不是扇形,解扇形面积的,免进!书上说是S=π(r1+r2)L,其中r1,r2是是上下底面半径,L是母线长!其实我是想求圆台的侧面积,因为圆台的侧面积是扇环,而](/uploads/image/z/2768442-42-2.jpg?t=%E6%89%87%E7%8E%AF%E9%9D%A2%E7%A7%AF%E5%A6%82%E4%BD%95%E6%8E%A8%E5%AF%BC%3F%E8%AF%B7%E7%9C%8B%E6%B8%85%E6%A5%9A%2C%E6%88%91%E9%97%AE%E7%9A%84%E6%98%AF%E6%89%87%E7%8E%AF%2C%E4%B8%8D%E6%98%AF%E6%89%87%E5%BD%A2%2C%E8%A7%A3%E6%89%87%E5%BD%A2%E9%9D%A2%E7%A7%AF%E7%9A%84%2C%E5%85%8D%E8%BF%9B%21%E4%B9%A6%E4%B8%8A%E8%AF%B4%E6%98%AFS%3D%CF%80%28r1%2Br2%29L%2C%E5%85%B6%E4%B8%ADr1%2Cr2%E6%98%AF%E6%98%AF%E4%B8%8A%E4%B8%8B%E5%BA%95%E9%9D%A2%E5%8D%8A%E5%BE%84%2CL%E6%98%AF%E6%AF%8D%E7%BA%BF%E9%95%BF%21%E5%85%B6%E5%AE%9E%E6%88%91%E6%98%AF%E6%83%B3%E6%B1%82%E5%9C%86%E5%8F%B0%E7%9A%84%E4%BE%A7%E9%9D%A2%E7%A7%AF%EF%BC%8C%E5%9B%A0%E4%B8%BA%E5%9C%86%E5%8F%B0%E7%9A%84%E4%BE%A7%E9%9D%A2%E7%A7%AF%E6%98%AF%E6%89%87%E7%8E%AF%EF%BC%8C%E8%80%8C)
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