R=a√3/3=18√3/3=6√3
D=2R=2×6√3=12√3
b=D√2/2=12√3×√2/2=6√6
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R=a√3/3=18√3/3=6√3
D=2R=2×6√3=12√3
b=D√2/2=12√3×√2/2=6√6