已知 ∠R、(x1,y1)、(x2,y2)、(x5,y5)求 (x3,y3)、(x4,y4)、∠R1
æ ¹æ®ç»å®çèç¹ï¼è®¡ç®å¤¹è§ä¿¡æ¯ï¼ç¤ºæå¾å¦ä¸ãå·²ç¥X1(x1, y1)ãX2(x2, y2)ãX3(x3, y3)ï¼è®¡ç®ç´çº¿X2X1ä¸X2X3ç夹è§ä¿¡æ¯ã
æ ¹æ®åéå 积ï¼å¾å°è®¡ç®å ¬å¼ä¸ºï¼
theta1 = acosd(dot([x1-x2,y1-y2],[x3-x2,y3-y2])/(norm([x1-x2,y1-y2])*norm([x1-x2,y3-y2])));
å ¶ä¸ï¼dot([x1-x2,y1-y2],[x3-x2,y3-y2])为计ç®å 积ï¼norm([x1-x2,y1-y2])为计ç®åéé¿åº¦ï¼acosd为计ç®ä»¥åº¦ä¸ºåä½ç夹è§ä¿¡æ¯ã
æ ¹æ®åéå 积ï¼å¾å°è®¡ç®å ¬å¼ä¸ºï¼
theta1 = acosd(dot([x1-x2,y1-y2],[x3-x2,y3-y2])/(norm([x1-x2,y1-y2])*norm([x1-x2,y3-y2])));
å ¶ä¸ï¼dot([x1-x2,y1-y2],[x3-x2,y3-y2])为计ç®å 积ï¼norm([x1-x2,y1-y2])为计ç®åéé¿åº¦ï¼acosd为计ç®ä»¥åº¦ä¸ºåä½ç夹è§ä¿¡æ¯ã
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