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設高為h,半徑為r,圓周率為π. 2πr²;+2πrh=314cm²; 2πrh=6πh²;為側面積.所以:2πrh=314-2πr²; 6πh²;=314-18πh²; 24πh²;=314 πh²;=157/12 所以:6πh²;=78.5=2πrh=側面積.
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