Mohon Bantuannya Kk kk

[tex]luas \: = \pi {r}^{2} \\ 616 = \frac{22}{7} {r}^{2} \\ {r}^{2} = 616 \times \frac{7}{22} \\ {r}^{2} = 196 \\ r = 14cm \\ d = 2 \times \: r \\ d = 2 \times 14 \\ d = 28cm[/tex]
diameter = 28cm
jari-jari = 14cm