\[ \text{弧长 } = 10 \times \frac{\pi}{3} = \frac{10\pi}{3} \text{ cm} \]
![\[ \text{弧长 } = 10 \times \frac{\pi}{3} = \frac{10\pi}{3} \text{ cm} \]](https://soloferat.biz.id/images/text---10-times-fracpi3--frac10pi3-text-cm-.jpg)
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- \( r \) 是半径，给定为 10 cm。
- \( \theta \) 是圆心角，提供为60°。但公式使用弧度，需转换：
- \[ \theta \text{ (弧度)} = \frac{60^\circ \times \pi}{180^\circ} = \frac{\pi}{3} \]
- #### \( \frac{10\pi}{3} \) cm or approximately 10.47 cm
- 一名投资者购入股票1000美元。在一年后，股票价格上涨25%，但投资者在价格下跌20%的第二天卖出了部分股票。若剩余股票价值仍为800美元，投资者最初卖出的是多少美元 worth的股票？
- 设初始持股价格为 \( p \) 美元，买入数量为：
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