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椭圆的几何性质

椭圆的几何性质. 椭圆的标准方程. y. O. x. y. O. x. y. b. a. O. c. x. 应用举例. 例 1 、求椭圆 的长轴和短轴的长、离心率、焦点 和顶点的坐标,并用描点法画出它 的图形。. 练习:求椭圆 的长轴和短轴的长、离心率、焦点 和顶点的坐标,并用描点法画出它 的图形。. 例 2 、求适合下列条件的椭圆的标准 方程:

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椭圆的几何性质

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  1. 椭圆的几何性质

  2. 椭圆的标准方程 y O x

  3. y O x

  4. y b a O c x

  5. 应用举例 例1、求椭圆 的长轴和短轴的长、离心率、焦点 和顶点的坐标,并用描点法画出它 的图形。

  6. 练习:求椭圆 的长轴和短轴的长、离心率、焦点 和顶点的坐标,并用描点法画出它 的图形。

  7. 例2、求适合下列条件的椭圆的标准 方程: (1)经过点P(-3,0),Q(0,-2) (2)长轴的长等于20,离心率等于

  8. 例3、已知椭圆的对称轴是坐标轴, O为坐标原点,F是一个焦点,A是 一个顶点,若椭圆的长轴是6,且 ,求椭圆的方程。

  9. 例4、已知椭圆的长轴长是短轴长 的2倍,且椭圆经过(-2,-4)点, 求椭圆的标准方程。

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