Determine all integers $ n > 3$ for which there exist $ n$ points $ A_{1},\cdots ,A_{n}$ in the plane, no three collinear, and real numbers $ r_{1},\cdots ,r_{n}$ such that for $ 1\leq i < j < k\leq n$, the area of $ \triangle A_{i}A_{j}A_{k}$ is $ r_{i} \plus{} r_{j} \plus{} r_{k}$.
To determine all integers \( n > 3 \) for which there exist \( n \) points \( A_1, A_2, \ldots, A_n \) in the plane, no three collinear, and real numbers \( r_1, r_2, \ldots, r_n \) such that for \( 1 \leq i < j < k \leq n \), the area of \( \triangle A_i A_j A_k \) is \( r_i + r_j + r_k \), we will analyze the cases for \( n = 4 \) and \( n = 5 \).

1. **Case \( n = 4 \)**:
   - Consider four points \( A_1, A_2, A_3, A_4 \) forming a convex quadrilateral.
   - We can take \( A_1, A_2, A_3, A_4 \) to be the vertices of a square.
   - Let the area of the square be \( S \). The area of any triangle formed by three vertices of the square is \( \frac{S}{2} \).
   - Set \( r_i = \frac{S}{6} \) for \( i = 1, 2, 3, 4 \). Then, for any three points \( A_i, A_j, A_k \), the area of \( \triangle A_i A_j A_k \) is \( r_i + r_j + r_k = \frac{S}{6} + \frac{S}{6} + \frac{S}{6} = \frac{S}{2} \), which matches the area of the triangle.
   - Therefore, \( n = 4 \) works.

2. **Case \( n = 5 \)**:
   - Suppose \( A_1, A_2, A_3, A_4, A_5 \) form a convex pentagon.
   - For a convex pentagon, the sum of the areas of the triangles formed by any three points must be consistent with the given condition.
   - If \( A_1, A_2, A_3, A_4, A_5 \) form a convex pentagon, then \( r_i + r_{i+2} \) must be the same for all \( i \) (indices modulo 5).
   - This implies that all \( r_i \) are equal, say \( r_i = r \) for all \( i \).
   - However, this leads to a contradiction because the area of \( \triangle A_1 A_2 A_3 \) cannot be equal to the area of \( \triangle A_1 A_2 A_5 \), as the latter includes a different set of points.
   - Therefore, \( n = 5 \) is impossible.

3. **Case \( n > 5 \)**:
   - If \( n > 5 \), then we can always find a subset of 5 points among the \( n \) points.
   - Since \( n = 5 \) is impossible, any \( n > 5 \) is also impossible.

Conclusion:
- The only integer \( n > 3 \) for which there exist \( n \) points \( A_1, A_2, \ldots, A_n \) in the plane, no three collinear, and real numbers \( r_1, r_2, \ldots, r_n \) such that for \( 1 \leq i < j < k \leq n \), the area of \( \triangle A_i A_j A_k \) is \( r_i + r_j + r_k \), is \( n = 4 \).

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