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Ответ:

Пошаговое объяснение:

Cередній рівень

1. а

2.

frac{1.2}{1.4}=frac{8.64}{x}

3.

frac{30}{100}=frac{8.4}{x}

4.

R=frac{1}{2}D=frac{2.7}{2}=1.35  \C=2pi R=2*3.14*1.35 =8.5

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