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α=180
r=αl/360 wzor
r=180*12/360
r=6cm
H²=l²-r²
H²=12²-6²=144-36=108=36*3
H=√(36*3)
H=6√3 cm
V=πr²H/3
V=6²*6√3π/3
V=36*2√3π
V=72√3π cm³