Construction:
(i) Drawn a line segment LM such that LM = 6.5 cm and marked a point P anywhere above LM
(ii) Placing one of the arms of the right angle of the set square along the line segment LM.
(iii) Sliding the set square along the line segment in such a way that the other arm of its right angle touches the point P. Draw a line along this side, passing through point P meeting LM at Q.
(iv) The line PQ is perpendicular to the line segment LM. ie LM ⊥ PQ.