Obliczmy pola poszczególnych prostokątów.

a)

$P_I=8\cdot 3=24{\text{cm}}^2$  

$P_{VI}=P_I=24{\text{cm}}^2$  

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$P_{II}=8\cdot 7=56{\text{cm}}^2$  

$P_{IV}=P_{II}=56{\text{cm}}^2$  

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$P_{III}=3\cdot 7=21{\text{cm}}^2$  

$P_V=P_{III}=21{\text{cm}}^2$  

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b)      

$P_I=27\cdot 9=243{\text{cm}}^2$   

$P_{VI}=P_I=243{\text{cm}}^2$  

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$P_{II}=27\cdot 14=378{\text{cm}}^2$   

$P_{IV}=P_{II}=378{\text{cm}}^2$  

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$P_{III}=9\cdot 14=126{\text{cm}}^2$   

$P_V=P_{III}=126{\text{cm}}^2$  

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c)

Zauważmy, że wszystkie ściany mają takie same wymiary.

$P_I=P_{II}=P_{III}=P_{IV}=P_V=P_{VI}=1,5\cdot 1,5=2,25{\text{dm}}^2$