Sunshine Zoo is a nice place to visit. Walk from the South Gate, go  1 , and you will find the Panda House. Pandas are  2  . They like eating   3  . To the north of the Panda House, you'll find the   4. They are the kings of the animal world. Remember not to go near them because they are  5. To the west of  6 Area, you will see lots of birds. They can make beautiful sounds. Go on and you will see the clever and  7 monkeys. To the east of the Monkeys' Forest, you will see the giraffes. The giraffe has a long   8 . It is the tallest animal on the earth(地球). To the north-east of the giraffes, there is a  9  . Cross it, and you will see the elephants. Their ears are 10 open fans.

利用作角平分线的方法，可以把一个已知角（　　）