I.

$h=15\text{cm}=1,5\text{dm}$  

$P_{\text{I}}=\frac{1}{2}\cdot 1,6\cdot 1,5=1,2\left[{\text{dm}}^2\right]$  

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II.

$P_{\text{II}}=\frac{1}{\sout{2}{}_1}\cdot \sout{20}{}^{10}\cdot 14=140\left[{\text{cm}}^2\right]=1,4\left[{\text{dm}}^2\right]$   

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III.

$h=14\text{cm}=1,4\text{dm}$  

$P_{\text{III}}=\frac{1}{2}\cdot 1,4\cdot 1,4=0,98\left[{\text{dm}}^2\right]$ 

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IV.

$P_{\text{IV}}=\frac{1}{2}\cdot 1,6\cdot 0,9=0,72\left[{\text{dm}}^2\right]$

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W luki wpisujemy:

I - B

II - A

III - C

IV - E