¤wª¾¥¿¤T¨¤§ÎABC¤º³¡¤@ÂIPPA=3 , PB=4 , PC=5¨D¥¿¤T¨¤§Î±¿n
¥Î±ÛÂà
¼g¹D:¤wª¾¥¿¤T¨¤§ÎABC¤º³¡¤@ÂIPPA=3 , PB=4 , PC=5¨D¥¿¤T¨¤§Î±¿n
¤£¤ÓÀ´¡H¡I
/s¬°"®Ú¸¹"µª®×¬O 9+ (25/s3)/4 ¶Ü
¤wª¾¥¿¡µ ABC ¤º¤@ÂIP¨Ï±o PA = 3¡APB = 4¡APC = 5¡A¡]¦p¹Ï¡^1. ¥t§@ ¡µBQC ¥þµ¥ ¡µAPC¡]¦p¹Ï¡^ ¦]¬°¨¤PCQ = 60«×¡A¥B CP = CQ = 5¡A ©Ò¥H ¡µPCQ¬°¤@¥¿¤T¨¤§Î , ±o PQ = 5 ¦Ó¥B ¡µPBQ¬°¤@3¡G4¡G5ªºª½¨¤¤T¨¤§Î2. ¥O ¨¤ PQB = £c¡A«h¨¤ CQB = £c + 60«×¡A ¥i±o cos¡]£c +60«×¡^= cos£c cos60 - sin£c sin60 = (3-4®Ú¸¹3)/10 ¥Ñ¾l©¶©w«ßª¾ BC¥¤è = 3¥¤è+ 5¥¤è -2(3)(5)cos(£c+60) = 34 ƒ{ 3¡]3 ƒ{ 4 ¡^ = 25+12®Ú¸¹3¡A§Y¥¿¡µ¤§Ãäªø¥¤è3. ¥¿¡µ ABC = [ (®Ú¸¹3)/4 ] * Ãäªø¥¤è = 9 + 25(®Ú¸¹3)/4 ~~~~~ «z! ¦nÃø¥´! ±Ï©R! ~~~~~~
_________________«Ä¤lÌ, §O¦A°Ý§Ú¬°¦ó¨C¤Ñ³£¬ï KAPPA ¤F!
¬O§_¦³¿ìªk§Q¥Î¤Ø³W§@¹Ï§â¤T¨¤§Î§ä¥X¨Ó¡H