1
绗竴閮ㄥ垎
骞宠鍥涜竟褰㈢殑鎬ц川缁冧範棰?/p>
1
銆佸鍥撅紝鍥涜竟褰?/p>
ABCD
鏄钩琛屽洓杈瑰舰锛?/p>
AB=6cm,BC=8cm
锛屸垹
B=70
掳
,
鍒?/p>
AD=________,CD=______,
鈭?/p>
D=_______,
鈭?/p>
A=______,
鈭?/p>
C=_______.
2
銆佸钩琛屽洓杈瑰舰
ABCD
鐨勫懆闀夸负
40cm,
涓ら偦杈?/p>
AB
銆?/p>
AC
涔嬫瘮涓?/p>
2
锛?/p>
3
锛屽垯
AB=_______,BC=________.
3
銆佸钩琛屽洓杈瑰舰寰楀懆闀夸负
50cm
锛屼袱閭昏竟涔嬪樊涓?/p>
5cm,
鍒欓暱杈规槸
________
锛岀煭杈规槸
__________.
4
銆佸钩琛屽洓杈瑰舰
ABCD
涓紝鈭?/p>
A-
鈭?/p>
B=20
掳
,
鍒欌垹
A=_______
鈭?/p>
B=________
5
銆?/p>
.
骞宠鍥涜竟褰?/p>
ABCD
涓紝
AE
骞冲垎鈭?/p>
DAB,
鈭?/p>
DEA=20
掳
,
鍒欌垹
C=____,
鈭?/p>
B_____.
6
銆佸钩琛屽洓杈瑰舰
ABCD
涓紝鈭?/p>
A+
鈭?/p>
C=200
掳
.
鍒欙細鈭?/p>
A=
_______
锛屸垹
B=
_________
.
7
銆佸鍥撅紝骞宠鍥涜竟褰?/p>
ABCD
鐨勫懆闀夸负
50
锛屽叾涓?/p>
AB=15
锛屸垹
ABC=60
掳锛屾眰骞宠鍥?/p>
杈瑰舰闈㈢Н銆?/p>
8
銆佸鍥撅紝鍦?/p>
ABCD
涓紝
DE
鈯?/p>
AB
锛?/p>
E
鏄瀭瓒筹紝濡傛灉鈭?/p>
C=40
掳锛屾眰鈭?/p>
A
涓庘垹
ADE
鐨勫害鏁般�?/p>
9
銆?/p>
濡傚浘锛?/p>
鍦?/p>
ABCD
涓紝
宸茬煡瀵硅绾?/p>
AC
鍜?/p>
BD
鐩镐氦浜庣偣
O
锛?/p>
鈻?/p>
BOC
鐨勫懆闀夸负
24
锛?/p>
BC=10
锛?
姹傚瑙掔嚎
AC
涓?/p>
BD
鐨勫拰鏄灏戯紵
10
锛庡鍥炬墍绀猴紝鍦?/p>
Y
ABCD
涓紝
AB=10cm
锛?/p>
AB
杈逛笂鐨勯珮
DH=4cm
锛?/p>
BC=6cm
锛屾眰
BC
杈逛笂鐨勯珮
DF
鐨勯暱锛?/p>
11
銆佸鍥撅紝
ABCD
鐨勫懆闀夸负
60
銕濓紝鈻?/p>
AOB
鐨勫懆闀挎瘮鈻?/p>
BOC
澶?/p>
8
銕濓紝姹?/p>
AB
銆?/p>
BC
鐨勯暱銆?/p>
绗簩閮ㄥ垎
骞宠鍥涜竟褰㈢殑鍒ゅ畾缁冧範棰?/p>
1.
濡傚浘锛?/p>
宸茬煡锛?/p>
E
銆?/p>
F
鏄钩琛屽洓杈瑰舰
ABCD
瀵硅绾?/p>
AC
涓婄殑涓ょ偣锛屽苟涓?/p>
AE=CF
銆傛眰璇侊細鍥涜竟褰?/p>
BFDE
鏄钩琛屽洓杈瑰舰
A
B
C
D
A
B
C
D
O
A
B
C
D
O
A
B
C
D
E