Question

find the diameter of the circle whose area is 154 sq metres​

Answer 1

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$area \: of \: circle = \pi {r}^{2} \\ 154 = 3.14 \times {r}^{2} \\ {r}^{2} = \frac{154}{3.14} \\ \\ {r}^{2} = 49 \\ r = \sqrt{49} \\ r = 7cm \\ \\ d = 2r \\ d = 2 \times 7 \\ d = 14cm$