keliling lingkaran yg memiliki luas 314 cm2 adlh?

[tex]l \: = \: \pi {r}^{2} \\ {314 \: cm}^{2} = 3.14 \times {r}^{2} \\ 314 \: \div 3.14 = {r}^{2} \\ \sqrt{100} = r \: \\ r \: = 10 \: cm \\ \\ k \: = \: 2 \times \pi \: r \\ = 2 \times 3.14 \times 10 \\ = 62.8 \: cm[/tex]