正弦定理 zhèng xián dìng lǐ 🔊 law of sines + Keep this word Meanings zhèng xián dìng lǐ law of sines Its characters 正zhèngstraightHSK 2弦xiánbow stringHSK 7–9定dìngto fix; to set; to make definiteHSK 4理lǐtextureHSK 6