# The co-ordinates of the initial and final point of a given vector A are respectively (2,3)and (10,6).Then calculate the magnitude of the vector.

$\vec{r}=(x_2-x_1)\hat{i}+(y_2-y_1)\hat{j}$
$=8\hat{i}+3\hat{j}$
Hence$\left| \vec{r}\right|=\sqrt{8^2+3^2}$