Hello, this is a very simple topic. First of all, let me introduce the concept of rounded corners to you. The angle formed by the rotation of light around its endpoint is called fillet. The fillet is equal to 360 degrees. At this point, I think the answer to the question is already there. A quarter is just a calculation problem, let alone an angle.

By the way, if you make mistakes in your homework exercises, you can send them to me to sort them out. I believe it will be helpful to your study! The following is the format I compiled. Welcome to make suggestions for improvement!