有大佬知道这里的三角形s1s2m为什么是直角三角形吗?微积分吗?请详细解释一下推导过程,谢谢 知乎 Template




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tomski有大佬知道这里的三角形s1s2m为什么是直角三角形吗?微积分吗?请详细解释一下推导过程,谢谢 知乎 coloring