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r=?
r=1/3*a√3/2=1/3*18√3/2=1/3*9√3=3√3
h=a√3/2
h=9√3
r=1/3*9√3
r=3√3
r = 1/3*a√3/2 = a√3/6
r = 18√3/6
r = 3√3