例1 12世纪印度著名数学家婆什迦罗给出了一个歌谣式的问题:波平如镜一湖面,半尺高处出红莲,亭亭多姿湖中立,突遭狂风吹一边.离开原处两尺远,花贴湖面像睡莲.请君动脑想一想,湖水在此深若干?(1米=3尺)分析解题的关键是根据题意画出图形,然后根据勾股定理列方程求解. Example 1 In the 12th century, the famous Indian mathematician Psjagaro gave a song-like question: Boping is a mirror of a lake, a red lotus is half a foot high, and the lake is full of neutrality, suddenly being blown away by the wind. Two feet away, the flowers are posted on the lake like a water lily. Please think about it, how deep is the lake? (1 m = 3 ft.) The key to analyzing the problem is to draw a graph based on the question, then according to the Pythagorean Theorem Solution.