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Pb stożka= πrl
r=8cm
l=18cm
Pb=π×8×18
Pb=144πcm²
Pk=144πcm²
144π=4πR²//÷4π
36=R²
R=6cm
Vkuli=4/3πR³
Vk=4/3π×6³
Vk=4/3π×216
Vk=288πcm³