如图在单位长度为1的正方形网格中,一段圆弧经过网格的交点A、B、C.
![](https://img.xkw.com/dksih/QBM/2019/12/5/2348584372568064/2350005532262401/STEM/61b87fd10abe4d47ba2ff7fcf7b1222c.png?resizew=160)
(1)请完成如下操作:
①以点O为坐标原点、竖直和水平方向为轴、网格边长为单位长,建立平面直角坐标系;
②根据图形提供的信息,只借助直尺确定该圆弧所在圆的圆心D,并连接AD、CD.(保留作图痕迹,不写作法)
(2)请在(1)的基础上,完成下列填空与计算:
①写出点的坐标:C 、D ;
②⊙D的半径= ;(结果保留根号)
③求扇形ADC的面积.(结果保留π)
![](https://img.xkw.com/dksih/QBM/2019/12/5/2348584372568064/2350005532262401/STEM/61b87fd10abe4d47ba2ff7fcf7b1222c.png?resizew=160)
(1)请完成如下操作:
①以点O为坐标原点、竖直和水平方向为轴、网格边长为单位长,建立平面直角坐标系;
②根据图形提供的信息,只借助直尺确定该圆弧所在圆的圆心D,并连接AD、CD.(保留作图痕迹,不写作法)
(2)请在(1)的基础上,完成下列填空与计算:
①写出点的坐标:C 、D ;
②⊙D的半径= ;(结果保留根号)
③求扇形ADC的面积.(结果保留π)
更新时间:2019-12-07 14:41:24
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【知识点】 画圆(尺规作图)
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