Did the Ancient China
have any historically
famous books

The Four Books and Five Classics were perhaps the most influential written works in Ancient Chinese history. They outlined the philosophies and ideas of Confucianism. Knowledge of these works was very important in order to pass the civil service exams.

answer: this problem has only trivial solutions, with all points on the same line. x=5 or x=7/5.

step-by-step explanation:

there are three triangles, and three unknowns: x, y=length of middle segment, and z=cos(angles marked with red arc).

we need

and law of cosines,

the three equations are

see attached image for solution.