Răspuns :
[tex] A_{t}= A_{l}+2 A_{b } \\ A_{l}= P_{b}*l(l-muchia laterala) \\ A_{l}=4*4*4=64 cm^2 \\ A_{b}=4*4* \frac{1}{2}=8 cm^2 [/tex]
[tex] A_{t}=64+2*8=80cm^2 [/tex]
[tex] A_{t}=64+2*8=80cm^2 [/tex]