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d1=6dm
d2=6dm
P=d1*d2/2
P=6dm*6dm/2
p=36dm2/2
p=18dm2
a(bok ściany)=1/2 d
a=3dm
P= a²√3 przez 4
P=(3²√3)/4
p=9√3/4
P=2,25√3 dm²
D=a√3
D=60cm=6dm
D=a√3/:√3
a=D/√3
P=a²
P=(D/√3)²
P=(6/√3)²
P=36/3=12dm²