1. Draw a circle about point P with radius r. Gauge equal distance about P by eye. |

2. Lightly extend the radius of the given arc. Add the given radius to the radius of the arc. 3. Draw a circle with C as the centre through point 1 and intersecting the circle about P at x. The intersection x is the centre of the required arc. |

4. Draw a circle about x as the centre touching the given arc and going through the point P. 5. Darken in the required arc. |