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設球的半徑為r,則圓錐的底面半徑為2r 1/3π(2r)²;h=4/3πr³; 4r²;h=4r³; h=r R=根號2倍的r 圓錐的側面積=根號2倍的πr²; 球的表面積=4πr²; 比為1/4倍的根號2
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