圆台侧面展开图的扇环圆心角是怎么求?即推导:θ=2π(R-r)/L.
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![圆台侧面展开图的扇环圆心角是怎么求?即推导:θ=2π(R-r)/L.](/uploads/image/z/8283380-68-0.jpg?t=%E5%9C%86%E5%8F%B0%E4%BE%A7%E9%9D%A2%E5%B1%95%E5%BC%80%E5%9B%BE%E7%9A%84%E6%89%87%E7%8E%AF%E5%9C%86%E5%BF%83%E8%A7%92%E6%98%AF%E6%80%8E%E4%B9%88%E6%B1%82%3F%E5%8D%B3%E6%8E%A8%E5%AF%BC%EF%BC%9A%CE%B8%3D2%CF%80%28R-r%29%2FL.)
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