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15=a² /√
a= √15
h=a
h= √15
2πr= √15 /: 2π
r= √15/2π
V = πr2*h
V=π (√15/2π) ² * √15
V= 15/4π² * √15π
V=15√15π/ 4π²
V=15√15/4π