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数学
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圆锥的轴截面是正三角形 圆锥的侧面展开图的圆心角是?
人气:328 ℃ 时间:2020-04-16 10:28:36
解答
设圆锥底面直径为x
则底面周长为 πX
侧面的高为X (因为轴截面是正三角形)
侧面展开的扇形圆心角 等于 πX/X 等于π 就是180度
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