The line segment between two vertices is called the real axis of hyperbola, and half of the length of the real axis is called the semi-real axis, and the length of the real axis is 2a(a is the parameter in the standard equation). Let x=0 and y=-b in the standard equation, and there is no real root. For drawing convenience, draw B 1(0, b) and B2(0, -b) on the Y axis, and take B 1B2 as the imaginary axis.
Let the absolute value of the difference between the distance in the plane and two fixed points F 1, F2 be equal to a constant (constant 2a, less than |F 1F2|) as a hyperbola; The locus of a point whose absolute value of the distance difference between two points on a plane is a fixed length is called hyperbola.
Methods of learning geometry well
1, the use of teaching AIDS, primary school students' thinking ability and logical ability are still in the forming stage. It is difficult to establish a clear expression of theory in textbooks only through text narration. In the process of learning geometry, it is best to understand it through teaching AIDS.
2. cultivate interest. Interest is the best teacher. Many students are very interested in mathematics when they first come into contact with it, but why do they start to hate it? To a large extent, it is because of frustration. When students miscalculate and do wrong questions, parents' first reaction is criticism and accusation. Over time, children begin to avoid math learning.
3, the formation of thinking, mathematical problems are more complicated, and geometry is worse. However, the solution of geometry problems is particularly simple, because geometry has prescribed steps to follow. As long as you follow the steps step by step, you will get the answer in the end.