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 Sketch Coloring Page

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

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