typo of an added minus sign on problem 13, on the centre of the circle, should be (-0.5,-1,0.5) <img width="1263" height="652" alt="Image" src="https://github.com/user-attachments/assets/dee007ac-17d5-42f4-a804-455d544e908e" />
typo of an added minus sign on problem 13, on the centre of the circle, should be (-0.5,-1,0.5)