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r=3cm
a²+b²=c²
3²+b²=6²
9+b²=36
b=√27
b=√9*3
b=3√3
V=⅓Pp*H
V=⅓*πr²*H
V=⅓*π*3cm²*3√3cm
V=⅓*9πcm²*3√3cm
V=9√3πcm³
V=9√3*3,14
V=28,26√3cm³