Naloge

$o=2a+2c$

$o=2\cdot 8,2\,\rm{cm}+2 \cdot 4,25\,\rm{cm}$

$o=24,9\,\rm{cm}$

$x^2=c^2-\left( \frac{e}{2} \right) ^2$

$x^2=(4,25\,\rm{cm})^2-(1,8\,\rm{cm}) ^2$

$x^2=14,8225\,\rm{cm}^2$

$x=3,85\,\rm{cm}$

$y^2=a^2-\left( \frac{e}{2} \right) ^2$

$y^2=(8,2\,\rm{cm})^2-(1,8\,\rm{cm}) ^2$

$y^2=64\,\rm{cm}^2$

$y=8\,\rm{cm}$

$f=x+y=3,85\,\rm{cm}+8\,\rm{cm}=11,85\,\rm{cm}$

$p=\frac{e\cdot f}{2}$

$p=\frac{3,6\,\rm{cm}\cdot 11,85\,\rm{cm}}{2}$

$p=21,33\,\rm{cm^2}$