Let $ ABCD$ be an isosceles trapezium. Determine the geometric location of all points $ P$ such that \[ |PA| \cdot |PC| \equal{} |PB| \cdot |PD|.\]
1. **Assume the configuration**: Let \(ABCD\) be an isosceles trapezium with \(AB \parallel DC\) and \(AB \geq DC\). Let \(Q\) be the intersection of the diagonals \(BC\) and \(AD\).

2. **Define the ratio**: Suppose \(\frac{PB}{PC} = k\). This implies that point \(P\) lies on a circle \(\mathcal{K}\) that is coaxial with points \(B\) and \(C\).

3. **Symmetry and congruence**: Similarly, since \(\frac{PA}{PD} = \frac{PB}{PC} = k\), point \(P\) also lies on another circle \(\mathcal{K}'\) that is coaxial with points \(A\) and \(D\).

4. **Intersection of circles**: By symmetry, the circles \(\mathcal{K}\) and \(\mathcal{K}'\) intersect on the common perpendicular bisector \(p\) of the segments \(AB\) and \(DC\). Therefore, \(p\) belongs to the locus of points \(P\).

5. **Special case when circles coincide**: When the circle \(\mathcal{K}\) is centered at \(Q\), the congruent circle \(\mathcal{K}'\) is also centered at \(Q\), and they coincide into one circle \((Q)\). Thus, the circle \((Q)\) also belongs to the locus.

6. **Intersection with segment \(BC\)**: Let the circle \((Q)\) intersect the segment \(BC\) at point \(R\). Using the property of the circle, we have:
   \[
   \sqrt{\frac{QB}{QC}} = \frac{RB}{RC} = \frac{QB - QR}{QR - QC}
   \]
   Solving for \(QR\), we get:
   \[
   QR = \sqrt{QB \cdot QC}
   \]

7. **Conclusion**: The locus of points \(P\) such that \(|PA| \cdot |PC| = |PB| \cdot |PD|\) is the union of the perpendicular bisector \(p\) of \(AB\) and \(DC\) and the circle \((Q)\).

The final answer is \( \boxed{ p \cup (Q) } \).