BridgeBaron, I am aware of your point.
However what we are trying to capture by the use of angles is the relationship between time and price (in points), or the hypotenuse of a triangle.
If we use a semi-log chart then the relationship breaks down as the x-axis remains the same, but the y-axis changes.
A move might have been 200pts down in 55 days and the next move might be 3 times this but instead be down 476.68pts in 400 days which is exactly 3 times the value of the previous move.
If we used angles on a linear chart we would observe this.
If we used a semi-log chart then we would not.
Essentially by using angles we are using vectors and need a linear chart.
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