Calculate the length of the median through the vertex $\mathrm{A}$ of the triangle $\mathrm{ABC}$ with vertices $\mathrm{A}\left(7,-3\right),\mathrm{B}\left(5,3\right),\mathrm{C}\left(3,-1\right)$.

If two vertices of a parallelogram are $\left(3, 2\right), \left(-1, 0\right)$ and its diagonals meet at $\left(2, -5\right)$, find the other two vertices of the parallelogram.

The mid-point of the line segment $AB$ shown in the adjoining diagram is $\left(4, -3\right)$. Write down the coordinates of $A$ and $B$.