Respuesta :

2 cm x 9 cm
3 cm x 6 cm

18 / 4 = 4.5, just in case its a square. But this is not a whole number so... 

2 and 7. 2 + 2 + 7 + 7 = 18. 

6 and 3. 6 + 6 = 12 + 3 + 3 = 18
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