hitunglah panjang diameter bila luas lingkaran 154cm(kuadrat)

[tex]l = \pi \times {r}^{2} \\ 154 = \frac{22}{7} \times {r}^{2} \\ 154 \times 7 = 22 \times {r}^{2} \\ 1078 = 22 {r}^{2} \\ \frac{1078}{22} = {r}^{2} \\ 49 = {r}^{2} \\ \sqrt{49 } = r \\ 7 = r[/tex]semoga bermanfaat