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k=a
h²=a²-R² R-promien okr. opisanego R=a/3·√3
h²=a²-1/3·a²=2/3·a²⇒h=a√(2/3)
Pp=a²/4·√3
V=1/3Pp·h=a²/12√3·a√(2/3)=a³/12·√2
DANE V=√2
a³/12·√2=√2
a³=12
a=∛12
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