Traders commonly refer to the angle formed when the price or moving average changes. Big changes form big angles, while small changes form small angles.
That's the idea, とにかく. The mathematically reality is that the concept of angle does not exist. Let's take a look at an example that most people would be comfortable with.
The angle θ in this triangle is 48.59°. The reason we can do this simple geometric comparison is that the units of each side of the triangle are measured in feet. If the units are not the same, it is not possible to take the angle. Now let's do an absurd example to prove the point.
Turning our attention back to trading, think about each leg of the triangle as it appears on your chart. The horitzontal leg is time. The vertical leg is price. Are these units identical? いいえ, they are clearly different. Therefore, you cannot find the angle between them.