We choose 5 points $A_1, A_2, \ldots, A_5$ on a circumference of radius 1 and centre $O.$ $P$ is a point inside the circle. Denote $Q_i$ as the intersection of $A_iA_{i+2}$ and $A_{i+1}P$, where $A_7 = A_2$ and $A_6 = A_1.$ Let $OQ_i = d_i, i = 1,2, \ldots, 5.$ Find the product $\prod^5_{i=1} A_iQ_i$ in terms of $d_i.$
1. We start by considering the given points \( A_1, A_2, \ldots, A_5 \) on the circumference of a circle with radius 1 and center \( O \). Let \( P \) be a point inside the circle. We need to find the product \( \prod_{i=1}^{5} A_iQ_i \) in terms of \( d_i \), where \( Q_i \) is the intersection of \( A_iA_{i+2} \) and \( A_{i+1}P \), and \( OQ_i = d_i \).

2. We use the given relationship:
   \[
   \frac{\overline{A_iQ_i}}{\overline{Q_iA_{i+2}}} = \frac{\triangle A_iPA_{i+1}}{\triangle A_{i+2}PA_{i+1}}, \quad i = 1, 2, 3, 4, 5
   \]
   Multiplying these five equations, we get:
   \[
   \prod_{i=1}^{5} \frac{\overline{A_iQ_i}}{\overline{Q_iA_{i+2}}} = 1 \quad \text{(i)}
   \]

3. Next, we consider the power of point \( Q_i \) with respect to the circle. Suppose \( \overrightarrow{A_iO} \) meets the circle again at \( A'_i \). The power of \( Q_i \) is given by:
   \[
   \overline{A_{i+1}Q_i} \cdot \overline{Q_iA'_{i+1}} = (1 + d_{i+1})(1 - d_{i+1}) = 1 - d_{i+1}^2
   \]
   Since \( \overline{A_iQ_i} \cdot \overline{Q_iA_{i+2}} = 1 - d_i^2 \), we have:
   \[
   \overline{A_iQ_i} \cdot \overline{Q_iA_{i+2}} = 1 - d_i^2, \quad i = 1, 2, 3, 4, 5
   \]
   Multiplying these five equations, we get:
   \[
   \prod_{i=1}^{5} \overline{A_iQ_i} \cdot \overline{Q_iA_{i+2}} = \prod_{i=1}^{5} (1 - d_i^2) \quad \text{(ii)}
   \]

4. Combining equations (i) and (ii), we have:
   \[
   \sqrt{\prod_{i=1}^{5} \frac{\overline{A_iQ_i}}{\overline{Q_iA_{i+2}}} \times \prod_{i=1}^{5} \overline{A_iQ_i} \cdot \overline{Q_iA_{i+2}}} = \sqrt{1 \times \prod_{i=1}^{5} (1 - d_i^2)}
   \]
   Simplifying, we get:
   \[
   \prod_{i=1}^{5} \overline{A_iQ_i} = \sqrt{\prod_{i=1}^{5} (1 - d_i^2)}
   \]

The final answer is \(\boxed{\prod_{i=1}^{5} \overline{A_iQ_i} = \sqrt{\prod_{i=1}^{5} (1 - d_i^2)}}\)