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$=\frac{a}{2.\tan \left({\displaystyle \frac{\mathrm{180°}}{n}}\right)}$

Millimeter (mm) Centimeter (cm) Decimeter (dm) Meter (m) Decameter (dam) Hectometer (hm) Kilometer (km)

$\frac{a}{2.\tan \left({\displaystyle \frac{\mathrm{180°}}{n}}\right)}$
= $\frac{\mathrm{10}}{2.\tan \left({\displaystyle \frac{\mathrm{180°}}{9}}\right)}(cm²)$
= $\frac{\mathrm{10}}{2.\tan \left({\displaystyle \frac{\mathrm{20°}}{}}\right)}(cm²)$
= $\frac{\mathrm{10}}{\mathrm{0,7}}(cm²)$
= 13,7 (cm²)