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Răspuns :

4(L+l+h)=24cm

=> L+l+h=6 cm  ridicam la patrat

=> (L+l+h) ²=36 cm²  

L²+l²+h²+2(L•l+L•h+l•h)=36cm²

2(L•l+L•h+l•h)=36cm²-( L²+l²+h²)

d=√(L²+l²+h²)=√14 cm

L²+l²+h²=14 cm²

2(L•l+L•h+l•h)=36cm²-14cm²=22cm²

At=2(L•l+L•h+l•h)=22cm²