ÌâÄ¿ÄÚÈÝ
ijµØÓÐÈý¼Ò¹¤³§£¬·Ö±ðλÓÚ¾ØÐÎABCD µÄ¶¥µãA,B ¼°CDµÄÖеãP ´¦£¬ÒÑÖªAB="20km,CB" ="10km" £¬ÎªÁË´¦ÀíÈý¼Ò¹¤³§µÄÎÛË®£¬ÏÖÒªÔÚ¾ØÐÎABCD µÄÇøÓòÖУ¨º¬±ß½ç£©£¬ÇÒÓëA,BµÈ¾àÀëµÄÒ»µãO ´¦½¨ÔìÒ»¸öÎÛË®´¦Àí³§£¬²¢ÆÌÉèÅÅÎ۹ܵÀAO,BO,OP £¬ÉèÅÅÎ۹ܵÀµÄ×ܳ¤Îªkm£®
£¨¢ñ£©Éè¡ÏBAO=(rad)£¬½«
±íʾ³É
µÄº¯Êý¹Øϵʽ£»
£¨¢ò£©ÇëÓ㨢ñ£©Öеĺ¯Êý¹Øϵʽ£¬È·¶¨ÎÛË®´¦Àí³§µÄλÖã¬Ê¹ÈýÌõÅÅÎ۹ܵÀ×ܳ¤¶È×î¶Ì£®
£¨¢ñ£©ÓÉÌõ¼þÖªPQ ´¹Ö±Æ½·ÖAB£¬Èô¡ÏBAO=(rad) £¬Ôò
, ¹Ê
£¬ÓÖOP£½
£¬
ËùÒÔ£¬
ËùÇóº¯Êý¹ØϵʽΪ
£¨¢ò£©
Áî0 µÃsin
£¬ÒòΪ
£¬ËùÒÔ
=
£¬
µ±Ê±£¬
£¬
ÊÇ
µÄ¼õº¯Êý£»µ±
ʱ£¬
£¬
ÊÇ
µÄÔöº¯Êý£¬ËùÒÔµ±
=
ʱ£¬
¡£
ÕâʱµãP λÓÚÏ߶ÎAB µÄÖд¹ÏßÉÏ£¬ÇÒ¾àÀëAB ±ßkm´¦¡£
½âÎö
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿