如图，已知PA、PB是⊙O的切线，A、B为切点，∠OAB＝30°．

（1）求∠APB的度数；
（2）当OA＝3时，求AP的长．

读短文，填空

    Hello ! My name is Amy .I'm a girl .I'm from England. Look !This is my father and this is my mother .My father is a teacher. My mother is a doctor .The boy is my brother .He's eight .He's a student .who's this girl ? Can you guess??