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2
Объяснение:
4.
R=2 см Sпов. куба=?
Sпов. куба=6*A₁D₁²
A₁D₁=D=2*R=4 (см) ⇒
Sпов. куба=6*4²=6*16=96 (см²).
ответ: Sпов. куба=96 см².
5.
ΣSграней=4*Sabc=49√3 см². AB=?
ответ: AB=7 см.