Respuesta :

So look:

1) 20 cm by 20 cm by 6 cm
2) 40 cm by 30 cm by 2 cm

Hope this helps!
Well two different rectangular prisms could be the following: 

1) 20 cm by 20 cm by 6 cm
2) 40 cm by 30 cm by 2 cm

I really hope I helped, and tag me if you need more help :) 

Thank you,
Darian