The third arc should be drawn centered at F is needed to be corrected in the diagram to fix the error.
Given:
Making a parallel line to line AB that passes through point P.
To locate:
The problem happened during the construction process.
The technique is as follows:
The first arc must be drawn with the center at C.
The second must be drawn with P in the center.
Finally, create the third arc, centered at F.
However, in this case, the third arc is centered at D. This is incorrect.
As a result, the correct step is for the third arc to be centered at F.
Final response:
The third arc should be drawn with the center at F.