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我覺得這道應該這樣考慮: 1,圓錐地面周長=216/360 XπX 10 =6π 2,圓錐地面半徑=6π/2π =3 3,圓錐高=(5^2-3^2)再開方(打不出根號) =4 4,圓錐容積(及體積)=sh =3^2πX 4 X 1/3(圓錐體積公式) =12π
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