tentukan diameter jika diketahui π=22/7 dan luas lingkaran 13,86 cm²

semoga bisa membantu

[tex]l = \pi \: r^{2} \\ 13.86 = \frac{22}{7} \times {r}^{2} \\ \frac{13.86}{ \frac{22}{7} } = {r}^{2} \\ 13.86 \times \frac{7}{22} = {r}^{2} \\ 4.41cm = {r}^{2} [/tex]
akar 4.41=r
2.1cm =r

[tex]diameter= 2 \times r \\ = 2 \times 2.1 \\ = 4.2cm[/tex]