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在人教版高中数学选修2—1第二章《圆锥曲线与方程》的章头图和章头文中,给出了用一个不垂直于圆锥轴线的平面去截圆锥,当平面与轴线夹角不同时,可以得到不同的截口曲线,它们分别是椭圆、抛物线、双曲线.通常把圆、椭圆、抛物线、双曲线统称为圆锥曲线.但具体什么时候截得的是椭圆、双曲线和抛物线,课本中没有详细介绍,而在近几年的高考
In the PEP and the captions of Chapter 2, Chapter 2 of Chapter 2 of the PEP Supplementary Mathematics, we show that using a plane that is not perpendicular to the axis of the cone to truncate the cone, when the angle between the plane and the axis Not the same time, you can get different cut-off curve, they are elliptic, parabolic, hyperbolic.Usually the circle, ellipse, parabola, hyperbolic collectively referred to as the conic curve, but specifically what time is intercepted ellipses, hyperbolic and parabolic , Textbooks are not described in detail, and in recent years college entrance examination