Luas sebuah lingkaran 3.850 cm².Carilah diameternya?

[tex]luas = \pi \times {r}^{2} \\ 3850 = \frac{22}{7} \times {r}^{2} \\ 26950 \div 22 = {r}^{2} \\ 1225 = {r}^{2} \\ \sqrt{1225} = r \\ 35 = r \\ 70 = d[/tex]

d = √[(28 x L) ÷ 22]
d = √[(28×3850) ÷ 22)
d = √107.800 cm² ÷ 22
d = √4900cm
d = 70 cm


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