Luas suatu lingkaran 1.017,36 cm².Tentukan diameter lingkaran tersebut!

[tex]l \: = \pi \times {r}^{2} \\ \\ 1017.36 = 3.14 \times {r}^{2} \\ {r}^{2} = 1017.36 \div 3.14 \\ {r}^{2} = \sqrt[2]{324} \\ {r}^{2} = 18 \: cm \\ \: \\ d \: = 18 \times 2 \\ = 36 \:cm[/tex]