tolong bantu jawab plis :(

[tex]r = \sqrt{462 \div \frac{22}{7} } \\ r = \sqrt{ \frac{462 \times 7}{22} } \\ r = \sqrt{147} \\ r = 12.1 = 12
[/tex]
[tex]keliling = 2 \times \pi \times r \\ = 2 \times \frac{22}{7} \times 12 \\ = 75.4[/tex]
Semoga membantu ☺