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r=3√3
r=⅓ ×a√2 ÷3 =a√2
r=a√2 / ÷√2
a =r ÷√2=r√2 ÷2
a=3√3÷√2=3√3 × √2 ÷ 2=³/₂×√6
B)
r=3
a=3√2 ÷2=³/₂ ×√2
C)
r=√15
a=√15 × √2 ÷ 2 = √30 ÷ 2=½√30