Question

Draw a line l and point X on it. Through X, draw a line segment `overline"XY"` perpendicular to l.

Now draw a perpendicular `overline"XY"` to at Y. (use ruler and compasses) 

Answer 1

1. Draw a line l and mark a point X on it.
   
2. Taking X as centre and with a convenient radius, draw an arc intersecting line l at two points A and B.
   
3. With A and B as centres and a radius more than AX, construct two arcs intersecting each other at Y.
   
4. Join XY.  `overline"XY"` is perpendicular to l.
   
   Similarly, a perpendicular to `overline"XY"` at the point Y can be drawn. The line is perpendicular to `overline"XY"` at Y.