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Pb=12√3 cm²
V=?
Pb=3PΔ
PΔ=Pp=12√3:3
PΔ=4√3
PΔ=a²√3/4
a²√3/4=4√3 /:√3
a²/4=4
a²=16
a=4 cm
h²+(2/3*a√3/2)²=a²
h²=(4√3/3)²=14
h²=16-16/3
h²=32/3
h=√32/3
h=4√2/√3
h=4√6/3 cm
V=1/3*4√3*4√6/3
V=16√2/3 cm³