Explicação passo-a-passo:
[tex]vol.quadrado = l \times l \times c \\ vol.paralelepipedo = b \times h \times c \\ q_{vol} = b \times b \times a = b^{2} \times a \\ p_{vol} = b \times c \times a \\ area_{total} = q_{vol} + 2p_{vol} \\ a_{total} = (b^{2} \times a) + 2(b \times c \times a) \\ a_{total} = ab^{2} + 2bca \\ a_{total} = ab(b + 2c)[/tex]
