Question

Area of circle is78.5sqm then radious?

Answer 1

Answer:

$area \: of \: circle = \pi {r}^{2} \\ 78.5 = 3.14 \times {r}^{2} \\ \frac{78.5}{3.14} = {r}^{2} \\ 25 = {r}^{2} \\ \sqrt{25} = {r} \\ \sqrt{5 \times 5} = r \\ r = 5$