42. Exemplar Exercise Problem XXI

$A \left(  6,1 \right)$, $B \left(  8,2 \right)$ and $C(9,4)$ are three vertices of a parallelogram $ABCD$. If $E$ is the midpoint of $DC$. Find the coordinates of $E$.

 

 

The coordinates of the point E is$\left(\begin{array}{lll}i& ,& \frac{i}{i}\end{array}\right)$.