已知点P到⊙O的最近距离是3cm、最远距离是7cm,则此圆的半径是   

已知点P到⊙O的最近距离是3cm、最远距离是7cm,则此圆的半径是      。若点P到⊙O有切线,那么切线长是________

答案

p;【答案】5cm或2cm;解析:
p;【解析】略

相关题目

He is from China. He looks        .       A. love   B. lover  
He is from China. He looks        .       A. love   B. lover     C. loving     D. lovely
商朝是青铜时代的繁盛时期,商朝青铜制造业发达的主要原
商朝是青铜时代的繁盛时期,商朝青铜制造业发达的主要原因是 A.商朝人掌握了高温冶炼技术 B.青铜制造业部门大规模使用奴隶劳动 C.从夏朝开
按原文填空。   1.                          ,
按原文填空。   1.                          ,水中藻、荇交横,盖竹柏影也。(《记承天寺夜游》)  2.何处无月?何处无竹柏?______________
  I was in my third year of teaching creative writing at a high school in New
  I was in my third year of teaching creative writing at a high school in New York, when one of my students, 15-year-old Mikey, gave me a note from his mother. It explained his absence from class
 They are the ____ who ____ Wuhan University and now are playing an important
 They are the ____ who ____ Wuhan University and now are playing an important part in our factory. A. graduate; graduated                                      
德国是欧洲人口最多的国家,在二战后和两德统一后也曾是
德国是欧洲人口最多的国家,在二战后和两德统一后也曾是全球住房荒最严重的国家之一。但发展到今天,其住房供应充沛、政策法律完善、房地产市
设分别是方程在区间(0,)上的解,则它们的大小关系是____
设分别是方程在区间(0,)上的解,则它们的大小关系是________。
If you read a lot,your life will be full__ __ pleasure. A.by        
If you read a lot,your life will be full__ __ pleasure. A.by        B.of         C.for       D.with

最新题目