Final answer:
To construct PQ, first construct AB and label the midpoint P on AB. Then proceed to construct PQ from P to Q.
Step-by-step explanation:
To construct PQ, we first need to construct AB and label the midpoint P on AB. Once AB is constructed, we can find its midpoint P by finding the point that divides AB into two equal parts.
Once P is located, we can then proceed to construct PQ, which is a line segment that starts at point P and extends to point Q.
The length and position of PQ will depend on the specific instructions or measurements given in the question.