14. (12 points) Divide a fixed square into 3 isosceles triangles, there are 4 different ways as shown in the figure: If a fixed square is divided into 4 isosceles triangles, how many different ways are there?
21
【Answer】Solution: As shown in the figure: $1+8+4+8=21$ (ways). Answer: There are a total of 21 different methods. Therefore, the answer is: 21.