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H-wysokośc stożka
r-promień podstawy
bo 45 stopni dlatego r=H
czyli
r²+H²=l²
r²+r²=(6√6)²
2r²=216
r²=108
r=6√3 H=6√3
V=⅓PpH
Pp=πr²
Pp=π(6√3)²=108π
V=⅓*108π*6√3=216√3