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[ammornil]

[tex]C=2\cdot \pi \cdot R \approx 2\cdot \frac{22}{7} \cdot \frac{14}{10}\approx \frac{\cancel{2}\cdot 2\cdot 11\cdot 2\cdot \cancel{7}}{\cancel{7}\cdot \cancel{2}\cdot 5}\approx \frac{44}{5} \approx 8,8\>[dm][/tex]

[tex]S=\pi\cdot R^{2} \approx \frac{22}{7}\cdot \left(\frac{14}{10}\right)^{2}\approx \frac{2\cdot 11}{\cancel{7}}\cdot \frac{\cancel{2^{2}}\cdot 7^{\cancel{2}}}{\cancel{2^{2}}\cdot 5^{2}}\approx \frac{154}{25}\approx 6,16 \approx 6,2\>[dm^{2}][/tex]