椭圆的几何性质资料.ppt

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1、椭圆的几何性质椭圆的范围即oxyx=-ax=ay=by=-b由-a≤x≤a,-b≤y≤b2021/7/282yxoF1F2··x2y2＋=1a22b椭圆的对称性2021/7/283yxoF1F2··x2y2＋=1a22b2021/7/284yxoF1F2··x2y2＋=1a22b2021/7/285yxoF1F2··x2y2＋=1a22b2021/7/286yxoF1F2··x2y2＋=1a22b2021/7/287yxoF1F2··x2y2＋=1a22b2021/7/288yxoF1F2··x2y2＋=

2、1a22b2021/7/289yxoF1F2··x2y2＋=1a22b2021/7/2810yxoF1F2··x2y2＋=1a22b2021/7/2811yxoF1F2··x2y2＋=1a22b2021/7/2812yxoF1F2··x2y2＋=1a22b2021/7/2813yxoF1F2··x2y2＋=1a22b2021/7/2814yxoF1F2··x2y2＋=1a22b2021/7/2815yxoF1F2··x2y2＋=1a22b2021/7/2816yxoF1F2··x2y2＋=1a22b202

3、1/7/2817yxoF1F2··x2y2＋=1a22b2021/7/2818yxoF1F2··x2y2＋=1a22b2021/7/2819yxoF1F2··x2y2＋=1a22b2021/7/2820yxoF1F2··x2y2＋=1a22b2021/7/2821yxoF1F2··x2y2＋=1a22b2021/7/2822yxoF1F2··x2y2＋=1a22b2021/7/2823yxoF1F2··x2y2＋=1a22b2021/7/2824yxoF1F2··x2y2＋=1a22b2021/7/282

4、5yxoF1F2··x2y2＋=1a22b2021/7/2826yxoF1F2··x2y2＋=1a22b2021/7/2827yxoF1F2··x2y2＋=1a22b2021/7/2828yxoF1F2··x2y2＋=1a22b2021/7/2829yxoF1F2··x2y2＋=1a22b2021/7/2830yxoF1F2··x2y2＋=1a22b2021/7/2831yxoF1F2··x2y2＋=1a22b2021/7/2832yxoF1F2··x2y2＋=1a22b2021/7/2833yxoF1F

5、2··x2y2＋=1a22b2021/7/2834yxoF1F2··x2y2＋=1a22b2021/7/2835yxoF1F2··x2y2＋=1a22b2021/7/2836yxoF1F2··x2y2＋=1a22b2021/7/2837yxoF1F2··x2y2＋=1a22b2021/7/2838yxoF1F2··x2y2＋=1a22b2021/7/2839yxoF1F2··x2y2＋=1a22b2021/7/2840yxoF1F2··x2y2＋=1a22b2021/7/2841yxoF1F2··x2y2

6、＋=1a22b2021/7/2842yxoF1F2··x2y2＋=1a22b2021/7/2843yxoF1F2··x2y2＋=1a22b2021/7/2844yxoF1F2··x2y2＋=1a22b2021/7/2845yxoF1F2··x2y2＋=1a22b2021/7/2846yxoF1F2··x2y2＋=1a22b2021/7/2847yxoF1F2··x2y2＋=1a22b2021/7/2848yxoF1F2··x2y2＋=1a22b2021/7/2849yxoF1F2··x2y2＋=1a22b

7、2021/7/2850yxoF1F2··x2y2＋=1a22b2021/7/2851yxoF1F2··x2y2＋=1a22b2021/7/2852yxoF1F2··x2y2＋=1a22b2021/7/2853yxoF1F2··x2y2＋=1a22b2021/7/2854YXOP（x，y）P2（-x，y）P3（-x，-y）P1（x，-y）关于x轴对称关于y轴对称关于原点对称2021/7/2855四、椭圆的离心率叫做椭圆的离心率。[1]离心率的取值范围：[2]离心率对椭圆形状的影响：1）e越接近1，c就越接近

8、a，b就越小，此时椭圆就越扁。2）e越接近0，c就越接近0，b就越大，此时椭圆就越趋近于圆。离心率反映椭圆的圆扁程度离心率：因为a>c>0，所以0