Complete the congruence statement.

$∆\mathrm{QRS}\cong$?

In a squared sheet, draw two triangles of equal areas such that the triangles are congruent

What can you say about their perimeters?

In a squared sheet, draw two triangles of equal areas such that the triangles are not congruent

What can you say about their perimeters?

If $\mathrm{\Delta ABC}$ and $\mathrm{\Delta PQR}$ are to be congruent, name one additional pair of corresponding parts. What criterion did you use?

Explain, why $\mathrm{\Delta ABC} \cong \mathrm{\Delta FED}$.