【易错题解析】苏科版九年级数学上册第二章 对称图形-圆 单元测试题.docx

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1、【易错题解析】苏科版九年级数学上册第二章对称图形-圆单元测试题一、单选题（共10题；共30分）1.如图，已知圆心角∠BOC＝100º，则圆周角∠BAC的大小是（   ）A. 50º                                    B. 100º                                    C. 130º                                    D. 200º2.如图所示，从⊙O外一点A引圆的切线AB，切点为B，连接AO

2、并延长交圆于点C，连接BC，已知∠A＝26°，则∠ACB的度数为（  ）A. 32°                                       B. 30°                                       C. 26°                                       D. 13°3.如图，∠AOB=100°，则∠A+∠B等于(  )A. 100°                                      B

3、. 80°                                      C. 50°                                      D. 40°4.已知圆锥的底面半径为6，母线长为8，圆锥的侧面积为（  ）A. 60                                       B. 48                                       C. 60π                                

4、       D. 48π5.在半径为6的⊙O中，120°圆心角所对的弧长是（　　）A. π                                        B. 2π                                         C. 4π                                         D. 6π 6.如图，已知⊙O的直径AB⊥弦CD于点E．下列结论一定正确的是（   ）A. AE＝OE                     

5、      B. CE＝DE                           C. OE＝CE                           D. ∠AOC＝60°7.如图，⊙O的弦AB＝8，M是AB的中点，且OM＝3，则⊙O的半径等于（）A. 8                                           B. 4                                           C. 10                          

6、                 D. 58.如图，两个同心圆，大圆的弦AB与小圆相切于点P，大圆的弦CD经过点P，且CD=13，PD=4，则两圆组成的圆环的面积是（  ）A. 16π                                     B. 36π                                     C. 52π                                     D. 81π9.已知⊙O的半径为2，点P是⊙O内一点，且OP=3，过P

7、作互相垂直的两条弦AC、BD，则四边形ABCD面积的最大值为（  ）A. 4                                           B. 5                                           C. 6                                           D. 710.如图，在矩形ABCD中，AB=3，BC=5，以B为圆心BC为半径画弧交AD于点E，连接CE，作BF⊥CE，垂足为F，则tan∠FBC的值

8、为（  ）A. 12                                         B. 25                                         C. 310                                         D. 13二、填空题（共10题；共30分）11.如图，点A、B、C都在⊙O上，OC⊥OB，点A在劣弧BC上，且OA=AB，则∠ABC=________．12.如图，点A，B，C，D分别在⊙O上，AB=AC，若∠A