Respuesta :

(top)10 x 12 = 120     (top)120 / 2 = 60      (side)13 x 3 = 39     (back)3 x 10 = 30
(sides)39 x 2 = 78        (tops/bottom)60 x 2 = 120      
(back)30 + (top/bottom)120 + (sides)78 = 228 [tex] cm^{2} [/tex]
Hope this helped :)