Răspuns:
Explicație pas cu pas:
Ex3
A(b)=6√3. Dar A(b)=l²·√3/4, ⇒l²·√3/4=6√3, ⇒l²·√3=4·6√3, ⇒l²=4·6, deci l=√(4·6)=2√6. Deci l=2√6.
A(l)=P(b)·h=3·l·h=3·2√6·2=12√6, deci A(l)=12√6.
A(t)=A(l)+2·A(b)=12√6+2·6√3=12√6+12√3=12(√6 +√3), deci
A(t)=12(√6 +√3).
V=A(b)·h=6√3·2=12√3, deci V=12√3.
