正弦定理是三角学中的一个基本定理，它指出**在任意一个平面三角形中，各边和它所对角的正弦值的比相等且等于外接圆的直径**。 正弦定理不仅在理论上具有重要的意义，而且在实际的应用中也非常广泛，比如在解决几何问题或进行工程计算时都可以应用此定理。
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