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2.阿中在畫圖時需要畫一個大圓,但是手邊沒有大型的圓規可用,剛好旁邊有一個圓錐體如下圖【題組】3.承上題,阿中覺得這個圓錐可以用來佈置教室,但是顏色太難看。阿中想要用壁報紙包住這個圓錐的側面,請問阿中
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2.阿中在畫圖時需要畫一個大圓,但是手邊沒有大型的圓規可用,剛好旁邊有一個圓錐體如下圖
【題組】3.承上題,阿中覺得這個圓錐可以用來佈置教室,但是顏色太難看。阿中想要用壁報紙包住這個圓錐的側面,請問阿中大約要剪一個半徑25且圓心角幾度的扇形才行?
(A)70度
(B)80度
(C)90度
(D)100度
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答案:D
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【評論內容】底部圓形的半徑為x 故x2=252-242 ...
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