Here’s a recent discussion related to indentation that you may find helpful: Indentation is important
In Python, code that belongs to a certain code block must share the same indentation level. In the code you included in your question, the print statements where you calculate area and circumference belong to the same code blocks as the code that collect the input variables, because those calculations depend on the input variables having already been defined.
To “improve your indentation”, you need to reach a conceptual understanding of what constitutes a code block. There is no shortcut here, you just need to practice.