绗?/p>
1
椤?/p>
鍏?/p>
11
椤?/p>
锛堜竴锛?/p>
1.
鍦ㄤ竴涓嚑浣曚綋鐨勪笁瑙嗗浘涓紝姝ｈ鍥惧拰淇鍥惧
鍙冲浘鎵�绀猴紝鍒欑浉搴旂殑淇鍥惧彲浠ヤ负
2.
宸茬煡鐭╁舰
ABCD
鐨勯《鐐归兘鍦ㄥ崐寰勪负
4
鐨勭悆
O
鐨勭悆闈笂锛屼笖
6,
2
3
AB
BC
飥?/p>
飥?/p>
,
鍒欐１閿?
O
ABCD
飥?/p>
鐨勪綋绉负
銆?/p>
3.
濡傚浘锛屽洓妫遍敟
P
鈥?/p>
ABCD
涓紝搴曢潰
ABCD
涓哄钩琛屽洓
杈瑰舰锛屸垹
DAB=60掳
,AB=2AD,PD
鈯ュ簳闈?/p>
ABCD.
(
鈪?/p>
)
璇佹槑锛?/p>
PA
鈯?/p>
BD
锛?/p>
(
鈪?/p>
)
鑻?/p>
PD=AD
锛屾眰浜岄潰瑙?/p>
A-PB-C
鐨勪綑寮﹀�笺�?/p>