91Ó°ÊÓ

Plot $A\left(1,2\right)$, $B\left(4,2\right)$, $C\left(2,4\right)$, $D\left(6,4\right)$, $E\left(6,7\right)$ and $\stackrel{¯}{DE}$ on the graph paper as shown below:

The two triangles are said to be congruent if they are copies of each other and if their vertices are superposed, then can say that the corresponding angles and the sides of the triangles are congruent.

Now, to locate point $F$so that $\mathrm{Δ}ABCâ‰\dots \mathrm{Δ}DEF$, and location of point $F$can be rather on right side or on left side of $\stackrel{¯}{DE}$.

If $\mathrm{Δ}ABCâ‰\dots \mathrm{Δ}DEF$then, corresponding parts of congruent triangles are congruent.

Therefore,

$\begin{array}{l}AB=DE\\ BC=EF\\ AC=DF\end{array}$

In the above graph, to reach point $C$from point $A$, move 1 box to the right and then, 2 box vertically above. In the same manner, to reach point $F$from point $D$, move 1 box vertically above and then, 2 boxes to the left. If from point $D$, will move 1 box vertically above and then, 2 boxes to the right, will get another location of point $F$.

See the graph given below:

Thus, from the graph conclude that point $F$can be $\left(4,5\right)$ and $\left(8,5\right)$ such that $\mathrm{Δ}ABCâ‰\dots \mathrm{Δ}DEF$.

Therefore, point $F$can be $\left(4,5\right)$and $\left(8,5\right)$such that $\mathrm{Δ}ABCâ‰\dots \mathrm{Δ}DEF$.