Diameter lingkaran yg luasnya 38.5 cm² adalah... (Mohon jawaban cepat ya, terima kasih)

[tex]l = \pi \times {r}^{2} \\ 38.5 = \frac{22}{7} \times {r}^{2} \\ 38.5 \times \frac{7}{22} = {r}^{2} \\ 12.25 = {r}^{2} \\ r = \sqrt{12.25} \\ r = 3.5 \: cm[/tex]

[tex]diameter \: = 2 \times r \\ diameter = 2 \times 3.5 \\ diameter = 7 \: cm[/tex]

SEMOGA MEMBANTU :)

[tex]luas = \frac{1}{4} \pi \: {d}^{2} \\ 38.5 = \frac{1}{4} .\frac{22}{7} .d {}^{2} \\ 1078 = 22d {}^{2} \\ d = \sqrt[]{49} \\ d = 7[/tex]
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