kak tolong jawab ya...pakai cara.. makasih kak

3. r = 10 d = 20
4. r = 15 d =30
5. r = 12 d = 24
6. r = 17.5 d = 35
7. r = 14 d = 28
8. r = 15 d = 3
9. r = 17 d = 34
10. r = 20 d = 40