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r=6 cm
Vg=πr²h
r=8 cm
Vk=4/3π*6³
Vk=4/3π*216
Vk=288π
Vg=π*8²*h
Vg=64πh
288π+64πh=64π(h+x)
288π+64πh=64πh+64πx
64πx=288π+64πh-64πh
64πx=288π
x=288π/64πx
x=4,5 cm