A convex $n$-gon $P$, where $n > 3$, is dissected into equal triangles by diagonals non-intersecting inside it. Which values of $n$ are possible, if $P$ is circumscribed?
1. **Claim**: The only possible value of \( n \) for which a convex \( n \)-gon \( P \) can be dissected into equal triangles by diagonals non-intersecting inside it, and \( P \) is circumscribed, is \( n = 4 \).

2. **Verification for \( n = 4 \)**:
   - Consider a square (a convex quadrilateral) which is circumscribed around a circle.
   - Draw one diagonal of the square. This diagonal divides the square into two equal triangles.
   - Thus, \( n = 4 \) works.

3. **General Case for \( n > 4 \)**:
   - Suppose \( P \) is a convex \( n \)-gon with \( n > 4 \) and is circumscribed around a circle.
   - Assume \( P \) is dissected into equal triangles by diagonals that do not intersect inside \( P \).

4. **Properties of Circumscribed Polygons**:
   - For a polygon to be circumscribed, all its sides must be tangent to a common circle.
   - This implies that the polygon is cyclic (all vertices lie on a common circle).

5. **Diagonal and Triangle Properties**:
   - Consider a diagonal \( AB \) of the \( n \)-gon.
   - Suppose \( \triangle ABC \) and \( \triangle ABD \) are two triangles formed by this diagonal in the triangulation.
   - Since the triangles are equal, the angles subtended by the arcs \( AC \) and \( AD \) at the circumference must be equal.

6. **Angle Analysis**:
   - Let \( \angle ACB \) and \( \angle ADB \) be the angles at vertices \( C \) and \( D \) respectively.
   - Since \( \triangle ABC \) and \( \triangle ABD \) are equal, \( \angle ACB = \angle ADB \).
   - In a cyclic polygon, the sum of opposite angles is \( 180^\circ \). Therefore, \( \angle ACB + \angle ADB = 180^\circ \).
   - Given \( \angle ACB = \angle ADB \), we have \( 2\angle ACB = 180^\circ \) which implies \( \angle ACB = \angle ADB = 90^\circ \).

7. **Implication of \( 90^\circ \) Angles**:
   - If \( \angle ACB = \angle ADB = 90^\circ \), then \( AB \) must be a diameter of the circumscribed circle.
   - This means that any diagonal used in the triangulation must be a diameter of the circle.

8. **Intersection of Diameters**:
   - Since any two diameters of a circle intersect at the center, it is impossible to draw more than one diameter without them intersecting.
   - Therefore, at most one diagonal can be drawn, which implies \( n \leq 4 \).

9. **Conclusion**:
   - Since \( n \) must be greater than 3 and the only value satisfying \( n \leq 4 \) is \( n = 4 \), the only possible value is \( n = 4 \).

\(\blacksquare\)

The final answer is \( \boxed{ n = 4 } \).