Fractal geometry helps analyze cities, but calculating their fractal dimension can be uncertain. This is because different methods and study areas can give different results. To solve this problem, researchers suggest using regular fractals as examples to understand why results vary. Factors like the city's structure and growth affect the fractal dimension. The solution is to compare cities using similar fractal dimensions. To do this, choose the right method and study area for each city. These tips can help students studying fractal cities.