7086| 12
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只用圓規(guī)如何把圓周平均分7,8,9,11分 |
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點(diǎn)評(píng)
我一般是算出周長(zhǎng),除等分?jǐn)?shù),再算出每條邊長(zhǎng)。畫(huà)個(gè)圓,然后以邊長(zhǎng)為半徑依次畫(huà)與分度圓的相切的圓弧
評(píng)分
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