Question

Find a radius of a circle, if it's area is 55.44

Answer 1

$area = \pi {r}^{2} \\ 55.44 = \frac{22}{7} \times {r}^{2} \\ \frac{55.44 \times 7}{22} = {r }^{2} \\ 35.28 = {r}^{2} \\ \sqrt{35.28} = r \\ 5.93 = r$

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