Draw a line AB and take a point P outside it. Draw a line CD parallel to AB and passing through the point P.
Steps of construction:
1. Draw a line AB.
2. Take a point Q on AB and a point P outside AB, and join PQ.
3. With Q as the centre and any radius, draw on arc to cut AB at E and PQ at F.
4. With P as the centre and the same radius, draw an arc cutting QP at G.
5. With G as the centre and the radius equal to EF, draw an arc to cut the previous arc at H.
6. Join PH and produce it on both the sides to get the required line.