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# EURUSD finding the scale and arc ratios

FX:EURUSD   Euro / U.S. Dollar
215 0
Here's one way of finding the scale of a chart. I set four arrow tool lines together. 2 vertical and 2 horizontal by their coordinates in the format section. Then I place a circle so the arrows touch it at the top and bottom right (in the pic). I set the circle to the horizontal length first, then readjust the vertical arrow length. The fib speed arc always keeps a perfect circular arc, no matter what scale. When the arrows touch that perfect arc, then PRICE/BARS=SCALE.
So .16293/65 bars = .00250662 SCALE.
To calculate the angle farther back on the chart. .04370/24 bars = .00182083333. Now divide that by the scale OR multiply by the scale inverse...and you get .726411. This represents the real y/x for the tan ratio... and arctan or tan inverse = 36 degrees.
These red angle numbers show that you can't just apply any FAN setting to a chart. A 30 degree angle on one chart can be a 60 degree angle on another. Scale also makes a difference in the way the arcs hit 2 points at once. Draw a wedge from a center to a point and watch what happens to the other points that the arc touches. They move and don't fit the wedge . This is actually useful because with the proper scaling as in this chart...you can find consistent radius distance relations...and even when changing the overall wedge size, there is still a ratio relation between the arcs. ie. arc 1= .72 (usually .764) and arc 2 = 1 etc.
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