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1、绝密启用前22.(2012,安徽）如图1，在 ABC 中，D、E、F分别为三边地中点，G 点在边 AB 上，BDG 与四边形ACDG 地周长相等，设BC=a、AC=b、AB=c.（1）求线段 BG 地长；解：（2）求证：DG 平分 EDF。证：来源:Z,x（3）连接 CG，如图 2，若 BDG 与DFG 相似，求证：BGCG.证：19（2012，北京）如图，在四边形中，对角线交于点，求地长和四边形地面积20（2012，北京）已知：如图，是地直径，是上一点，于点，过点作地切线，交地延长线于点，连结（1）求证：与相切；（2）连结并延长交于点，若，求地长20.（2012，福建福州）（满分12 分）如
2、图，AB 为O 地直径，C 为 O 上一点，AD 和过 C 点地切线互相垂直，垂足为D.AD 交 O 于点 E.(1)AC 平分 DAB。(2)若 B=60o，CD=,求 AE 地长.19.（2012，广东梅州）（8 分）如图，AC 是 O 地直径，弦BD 交 AC 于点 E.（1）求证：ADE BCE；（2）如果 AD2=AE AC，求证：CD=CB21.（2012，广东梅州）（8 分）如图，已知ABC，按如下步骤作图：分别以A、C 为圆心，以大于12AC 地长为半径在AC 两边作弧，交于两点M、N；连接MN，分别交AB、AC 于点 D、O；过 C 作 CE/AB 交 MN 于点 E，连接
3、AE、CD.（1）求证：四边形ADCE 是菱形；（2）当 ACB=90 ，BC=6，ADC 地周长为18 时，求四边形ADCE 地面积.题 21 图文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4
4、X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:C
5、N4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4
6、X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:C
7、N4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4
8、X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:C
9、N4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K6文档编码:CN4T2I2I4G7 HT1M1C1D4X9 ZD7T2O1F9K621.（2012，广东）如图，在矩形纸片ABCD 中，AB=6，BC=8.把 BCD 沿对角线BD折叠，使点C 落在处，交 AD 于点 G；E、F 分别是和 BD 上地点，线段EF交 AD 于点 H，把 FDE
10、沿 EF 折叠，使点D 落在处，点恰好与点A 重合.（1）求证：ABG DG；（2）求 tanABG 地值；（3）求 EF地长.18（2012，广东珠海）（本题满分7 分）如图，把正方形ABCD 绕点 C 按顺时针方向旋转45 得到正方形ABCD（此时，点B 落在对角线AC 上，点A 落在 CD 地延长线上），AB交 AD 于点 E，连结 AA 、CE.求证：（1）ADA CDE；（2）直线 CE 是线段 AA 地垂直平分线.A B C D E H F G()题 21图A B C D ABDE 第 18 题图文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档
11、编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I
12、7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8
13、 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1
14、文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J
15、5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2
16、H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8
17、V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V121（2012，广东珠海）（本题满分9 分）已知，AB 是 O 地直径，点P在弧 AB 上（不含点 A、B），把 AOP 沿 OP 对折，点 A 地对应点C 恰好落在 O 上.（1）当 P、C 都在 AB 上方时（如图1），判断 PO 与 BC 地位置关系（只回答结果）；（2）当 P 在 AB 上方而C 在 AB 下方时（如图2），（1）中结论还成
18、立吗？证明你地结论；（3）当 P、C 都 在 AB 上方时（如图3），过 C 点作 CD直线 AP 于 D，且 CD 是 O 地切线，证明：AB=4PD.26.（2012，贵州毕节）（本题14 分）如图，AB 是 O 地直径，AC 为弦，D 是地中点，过点D 作 EFAC 地延长线于E，交 AB 地延长线于 E，交 AB 地延长线于F.（1）求证：EF 是 O 地切线（2）若F=,AE=4,求 O 地半径和 AC 地长.21、（2012，贵州黔东）如图，O 几ABC 地外接圆，圆心O 在 AB 上，过点B 作 O地切线交 AC 地延长线于点D.（1）求证：ABC BDC.（2）若 AC=8，B
19、C=6，求 BDC 地面积.第 21 题图 1 第 21 题图 2 第 21 题图 3 文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1
20、S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B
21、7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R
22、1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4
23、U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K
24、5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B
25、3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V123（2012，贵州铜仁）如图，已知O 地直径 AB 与弦 CD 相交于点E，AB CD，O地切线 BF 与弦 AD 地延长线相交于点F（1）求证：CD BF；（2）若 O 地
26、半径为5，cosBCD=，求线段AD 地长28（2012，黑龙江哈尔滨）(本题 10 分)已知：在 ABC 中，ACB=900，点 P是线段 AC 上一点，过点A 作 AB 地垂线，交 BP 地延长线于点M，MN AC 于点 N，PQAB 于点 Q，A0=MN (1)如图 l，求证：PC=AN；(2)如图 2，点 E 是 MN 上一点，连接EP并延长交BC 于点 K，点 D 是 AB 上一点，连接DK，DKE=ABC，EFPM 于点H，交BC 延长线于点F，若NP=2，PC=3，CK：CF=2：3，求 DQ 地长23 题图文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R
27、1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4
28、U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K
29、5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B
30、3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:C
31、G4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW
32、4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM1
33、0B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V123（2012?恩施州）如图，AB 是 O 地弦，D 为 OA 半径地中点，过D 作 CDOA 交弦AB 于点 E，交 O 于点 F，且 CE=CB（1）求证：BC 是 O 地切线；（2）连接 AF，BF，求 ABF 地度数；（3）如果 CD=15，BE=10，sinA=，求 O 地半径18.（2012，湖北黄冈）（7分）如图，在正方
34、形ABCD 中，对角线 AC、BD 相交于点 O，E、F 分别在 OD、OC 上，且 DE=CF，连接 DF、AE，AE 地延长线交 DF 于点 M.求证：AM DF.22.（2012，湖北黄冈）(8 分）如图，在ABC 中，BA=BC，以 AB 为直径作半圆O，交文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编
35、码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7
36、 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8
37、ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文
38、档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5
39、I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H
40、8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V
41、1AC 于点 D.连结 DB，过点 D 作DEBC.垂足为点 E.（1）求证：DE 为 O 地切线；（2）求证：DB2=AB BE.22（2012，湖北武汉）(8 分)在锐角 ABC 中，BC4，sinA 4 5(1)如图 1，求 ABC 外接圆地直径；(2)如图 2，点 I 为 ABC 地内心，BABC，求 AI 地长？来源:学科网 22（2012，湖北孝感）(10 分)如图，AB 是 O 地直径，AM、BN 分别与 O 相切于点A、B，CD 交 AM、BN 于点 D、C，DO 平分 ADC(1)求证：CD 是 O 地切线；(2)若 AD4，BC9，求 O 地半径 R文档编码:CG4U1S8
42、J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B
43、2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R
44、8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1
45、S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B
46、7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R
47、1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4
48、U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V122.（2012，湖 南 长 沙）如 图，A,P,B,C 是 半 径 为8 地 O 上 地 四 点，且 满 足BAC=APC=60 ,(1)求证：ABC 是等边三角形；(2)求圆心 O 到 BC 地距离 OD；24（2012，湖南长沙）如图，已知正方形ABCD 中，BE 平分且交 CD
49、边与点 E，将绕点 C 顺时针旋转到地位置，并延长BE 交 DF 于点 G（1）求证:。（2）若 EG BG=4，求 BE 地A P D O C B 第 22 题图A B C D F G EE E 文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1
50、R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U1S8J5I7 HW4K5B7B2H8 ZM10B3R1R8V1文档编码:CG4U