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r=3√3=2/3h
h=a√3/4
2/3h=3√3
h=3√3*3/2
h=9√3/2
9√3/2=a√3/4
a=9√3/2*4/√3
a=18 j
P=18²√3/4
P=324√3/4
P=81√3 j²