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=2√12
h²=a²-a²/4
h=3/4·a²
wiec
h=a/2·√3
Pole P=1/2·a·h wiec
P=1/4·a²√3
DANE a=4⇒P=16/4·√3=4·√3
2√12=2√(3·4)=4√3
ODP d)