A regular $n$-gon is inscribed in a unit circle. Compute the product from a fixed vertex to all the other vertices.
1. **Move to the complex plane:**
   Consider the vertices of the regular $n$-gon as the $n$th roots of unity. These roots are given by:
   \[
   z_k = e^{2\pi i k / n} \quad \text{for} \quad k = 0, 1, 2, \ldots, n-1
   \]
   These points lie on the unit circle centered at the origin in the complex plane.

2. **Product of distances from a fixed vertex:**
   We need to compute the product of the distances from a fixed vertex to all other vertices. Without loss of generality, we can choose the fixed vertex to be $z_0 = 1$ (corresponding to $k=0$). The distances from $z_0$ to the other vertices $z_k$ are given by:
   \[
   |z_k - z_0| = |e^{2\pi i k / n} - 1|
   \]
   Therefore, the product we need to compute is:
   \[
   \prod_{k=1}^{n-1} |e^{2\pi i k / n} - 1|
   \]

3. **Transform the problem:**
   To simplify the computation, consider the polynomial whose roots are the $n$th roots of unity minus 1:
   \[
   P(z) = z^n - 1
   \]
   The roots of $P(z)$ are $z_k = e^{2\pi i k / n}$ for $k = 0, 1, 2, \ldots, n-1$. We are interested in the product of the distances from $1$ to these roots, which is equivalent to evaluating:
   \[
   \prod_{k=1}^{n-1} |e^{2\pi i k / n} - 1|
   \]

4. **Use symmetry and properties of roots of unity:**
   Notice that the polynomial $P(z)$ can be factored as:
   \[
   P(z) = (z - 1)(z - e^{2\pi i / n})(z - e^{4\pi i / n}) \cdots (z - e^{2\pi i (n-1) / n})
   \]
   Evaluating this polynomial at $z = 1$ gives:
   \[
   P(1) = (1 - 1)(1 - e^{2\pi i / n})(1 - e^{4\pi i / n}) \cdots (1 - e^{2\pi i (n-1) / n})
   \]
   Since $1 - 1 = 0$, we need to consider the product of the non-zero terms:
   \[
   \prod_{k=1}^{n-1} (1 - e^{2\pi i k / n})
   \]

5. **Magnitude of the product:**
   The magnitude of the product of complex numbers is the product of their magnitudes. Each term $|1 - e^{2\pi i k / n}|$ represents the distance from $1$ to the $k$th root of unity. Using the fact that the magnitude of a product is the product of the magnitudes, we have:
   \[
   \left| \prod_{k=1}^{n-1} (1 - e^{2\pi i k / n}) \right| = \prod_{k=1}^{n-1} |1 - e^{2\pi i k / n}|
   \]

6. **Final computation:**
   The product of the distances from $1$ to all other $n$th roots of unity is known to be $n$. This result can be derived from properties of cyclotomic polynomials and symmetry of the roots of unity.

Therefore, the product of the distances from a fixed vertex to all other vertices of a regular $n$-gon inscribed in a unit circle is:
\[
\boxed{n}
\]