1. The user asked for websites and links to help teach mensuration for grade 9 and 10 in Nepal. 2. This is a non-math question requesting educational resources. 3. As per instructions, I provide a short, friendly message without altering other rules. 4. Unfortunately, I cannot provide direct website links here, but I recommend searching for educational platforms like Khan Academy, BYJU'S, or local Nepalese educational portals that cover mensuration topics. 5. You can also check Nepal's Ministry of Education website or local school resources for curriculum-aligned materials.