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設圓錐的底面圓的半徑是R,則底面周長是2πR,扇形的弧長也是2πR圓錐的表面積等於底面圓的面積加側面積底面圓的面積是:πR²;扇形的弧長=60°÷360°×2π×母線長=2πR母線長=6R圓錐的側面積= 1/2×2πR×6R=6πR…
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