$15\text{m}\cdot 20\text{m}=300{\text{m}}^2$  

$52\text{a}=52\cdot 1\text{a}=52\cdot 100{\text{m}}^2=5200{\text{m}}^2$  

$1\text{ha}=10000{\text{m}}^2$    

$100\text{m}\cdot 102\text{m}=10200{\text{m}}^2$  

$142\text{a}=142\cdot 1\text{a}=142\cdot 100{\text{m}}^2=14200{\text{m}}^2$  

$130\text{m}\cdot 60\text{m}=7800{\text{m}}^2$  

 

Litera	S	O	L	S	K	I
Powierzchnia	$14200{\text{m}}^2$	$10200{\text{m}}^2$	$10000{\text{m}}^2$	$7800{\text{m}}^2$	$5200{\text{m}}^2$	$300{\text{m}}^2$