Given: Line a-b with tangent point T, and point P. 

1. From T on the given line draw a line to point P (line P-T is the chord of the required arc). 

2. Draw the perpendicular bisector d-e. 

3. From T draw a perpendicular line (by eye) to intersect d-e at C the centre of the required arc. 

4. With C as the centre, draw a circle with radius C-P going through P and T. 

5. Darken in the required arc P-T. 

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