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900π=4×π×r²
900=4×r²
r²=900÷4
r²=225
r=√225
r=15
v=4/3×π×r³
v=4/3×3.14×15³
v=4/3×3.14×3375
v=4×3.14×1125
v=3.14×4500
v=14130cm³