Zmierzmy potrzebne odcinki:

$P_I=3\text{cm}\cdot 1,5\text{cm}=4,5{\text{cm}}^2$  

 

$P_{II}=\frac{\left(0,5\text{cm}+2,5\text{cm}\right)\cdot 3\text{cm}}{2}=\frac{3\text{cm}\cdot 3\text{cm}}{2}=\frac{9}{2}{\text{cm}}^2=4,5{\text{cm}}^2$  

 

$P_{III}=1\text{cm}\cdot 3\text{cm}=3{\text{cm}}^2$  

 

$P_{IV}=\frac{\left(3\text{cm}+4\text{cm}\right)\cdot 1\text{cm}}{2}=7{\text{cm}}^2$  

 

$P_V=\frac{\sout{4}{}^2\text{cm}\cdot 2,5\text{cm}}{\sout{2}{}_1}=5{\text{cm}}^2$