Question

Draw any line segment $PQ$. Take any point $R$ not on it. Through $R$, draw a perpendicular to $PQ$(use ruler and set-square).

Answer 1

Step 1. Draw a given line segment $PQ$ and then place a point $R$ outside the line segment $PQ$ as follow:

Step 2. Next, arrange a set square on $PQ$ so that one of its right angles arms are aligned with $PQ$ as follows:

Step 3. Now, align the ruler with the edge of the established square that is opposite the right angle as follows:

Step 4. Hold the ruler in place and slide the set square along the ruler until the point $R$ reaches the other arm of the set square as follows:

Step 5. Finally, draw a line along the established square's boundary that passes through point $R$. We now have the necessary line perpendicular to $PQ$ as follow:

Hence, the diagram is shown below: