Question

take a point above a straight line AB . throught P draw a straight line PQ perpendicular to AB
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Answer 1

Answer:

Step I: Draw a line PQ and take a point R on it.

Step II: With R as centre and a convenient radius construct an arc touching the line PQ at two points A and B.

Step III: With A and B as centres and a radius greater than RA construct two arcs cutting each other at S.

Step IV: Join RS and extend it in both directions to get a line perpendicular to PQ.

Thus, XY is the line required which is perpendicular to PQ and passes through R as shown in the above image.