Answer:
To draw a perpendicular to \[{{l}_{1}}\] using ruler and set-square, we use the following steps: Step I Draw a line segment \[{{l}_{2}}\] and take a point R, outside of \[{{l}_{2}},\]. Step II Place a set-square on \[{{l}_{2}}\] such that one arm of its right angle aligns along \[{{l}_{1}},{{l}_{2}},{{l}_{3}}\]. Step III Place a ruler along the edge opposite to the right angle of the set-square. Step IV Hold the ruler fixed. Slide the set-square along the ruler till the point R touches the other arm of the set square. Step V Join RS along the edge through R meeting \[{{l}_{4}}\] at S. Hence, \[{{l}_{1}},{{l}_{2}},{{l}_{3}}\]
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