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如何手工画椭圆

更新时间: 2020-10-30 00:00:00     

画出直线AB,作AB的垂直平分线CD。连接AC,在AC上找一点D。使DC等于1/2长轴-1/2短轴。作AD的垂直平分线。与长轴交点O1,再作点O1的对称点O2。与短轴交点O3,再作点O3的对称点O4。以O3,O4为圆心,以O3E,O4D为半径画圆弧。再以O1为圆心,O1A为半径画圆弧。9再以O2为圆心,O2B为半径画圆弧即可。

椭圆(Ellipse)是平面内到定点F1、F2的距离之和等于常数(大于|F1F2|)的动点P的轨迹,F1、F2称为椭圆的两个焦点。其数学表达式为:|PF1|+|PF2|=2a(2a>|F1F2|)

关键词: 如何 手工 椭圆

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