The length of the line segment between the two goalposts is fixed. We regard the two goalposts and the three points of the ball as a triangle. The closer to the target, the smaller the height of the triangle.

At this time, there should be a trigonometric function relationship between the height, bottom and diagonal of the triangle. I don't remember the details. Through calculation, we should be able to see that the angle of this angle is inversely proportional to the height, indicating that the lower the height, the greater the corresponding angle!