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[
瀛︿範鐩爣
]
1.
鑳界敤姝ｅ鸡銆?/p>
浣欏鸡瀹氱悊杩涗竴姝ヨВ鍐充竴浜涙湁鍏充笁瑙掑舰鐨勮绠楅棶棰?/p>
.2.
鎺屾彙涓夎褰㈤潰绉?/p>
鍏紡鐨勭畝鍗曟帹瀵煎拰搴旂敤锛?/p>
鐭ヨ瘑鐐逛竴
涓夎褰㈠父鐢ㄩ潰绉叕寮忓強鍏惰瘉鏄?/p>
1
锛庡叕寮?/p>
(1)
涓夎褰㈤潰绉叕寮?/p>
S
锛?/p>
1
2
ah
.
(2)
涓夎褰㈤潰绉叕寮忕殑鎺ㄥ箍
S
锛?/p>
1
2
ab
sin
C
锛?/p>
1
2
bc
sin
A
锛?/p>
1
2
ca
sin
B
.
(3)
S
锛?/p>
1
2
r
(
a
锛?/p>
b
锛?/p>
c
)(
r
涓轰笁瑙掑舰鍐呭垏鍦嗗崐寰?/p>
)
锛?/p>
2
锛庤瘉鏄?/p>
(1)
涓夎褰㈢殑楂樼殑璁＄畻鍏紡
鍦ㄢ柍
ABC
涓紝杈?/p>
BC
锛?/p>
CA
锛?/p>
AB
瀵瑰簲鐨勮竟闀垮垎鍒负
a
锛?/p>
b
锛?/p>
c
锛岃竟涓婄殑楂樺垎鍒涓?/p>
h
a
锛?/p>
h
b
锛?/p>
h
c
锛?/p>
鍒?/p>
h
a
锛?/p>
b
sin
C
锛?/p>
c
sin
B
锛?/p>
h
b
锛?/p>
c
sin
A
锛?/p>
a
sin
C
锛?/p>
h
c
锛?/p>
a
sin
B
锛?/p>
b
sin
A
.
鍊熷姪涓婅堪缁撹锛屽鍥撅紝鑻ュ凡鐭モ柍
ABC
涓殑杈?/p>
AC
锛?/p>
AB
锛岃
A
锛岄偅涔?/p>
AB
杈逛笂鐨勯珮
CD
锛?/p>
b
sin_
A
锛?/p>
鈻?/p>
ABC
鐨勯潰绉?/p>
S
锛?/p>
1
2
bc
sin
A
.
(2)
涓夎褰㈢殑闈㈢Н涓庡唴鍒囧渾
宸茬煡鈻?/p>
ABC
鍐呭垏鍦嗗崐寰勪负
r
锛屼笁杈归暱涓?/p>
a
锛?/p>
b
锛?/p>
c
锛屽垯鈻?/p>
ABC
鐨勯潰绉负
S
锛?/p>
1
2
r
(
a
锛?/p>
b
锛?/p>
c
)
锛?/p>
濡傚浘锛岃鈻?/p>
ABC
鍐呭垏鍦嗗渾蹇冧负
O
锛岃繛鎺?/p>
OA
锛?/p>
OB
锛?/p>
OC
锛?/p>