Fibonacci expansion - page 2

[phumai]

Forex Trader:
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How do you calculate the distance to the third point (C) from the previous tow points in Fibonacci expansion?

[phumai]

how do you calculate the length of the ray form the second to the third reference point from the distance of the first and second points?

[phumai]

As you see in MT4 in the attached picture, the second line of Fibonacci Expansion is automatic adjusted. I just want to know how do you calculate the length of the second line?