[Repost] Xiaoyin, 12 years old, Beijing

The dwarf who col­lects flo­ral water:)Orig­i­nal address:Xiaoyin, 12 years old, Bei­jingauthor:Zheng­sheng Online Course Assign­ments   
The most dif­fi­cult part of this assign­ment was fig­ur­ing out what the gold­en ratio is. Why is it nec­es­sary to divide it? O(∩_∩)O Ha! I’m afraid the teacher needs to explain it in more detail:)