Question

знайты площу Круга радиус якого 7 см​

Answer 1

$S=\pi R^2\\S=\pi *7^2=49\pi .$

Answer 2

r=7cm

$S = \pi {r}^{2} \\ S = 3.14 \times 49 \\ S = 153.9 \: {cm}^{2}$