The four-sided geometric figure pictured is called a parallelogram. One feature of parallelograms is that opposite sides have equal lengths.

A parallelogram is shown. It is folded from one point to another to form 2 triangles.

The dotted line splits the parallelogram into two triangles. What is true about the congruency of the two triangles?

More information is needed.
The triangles can be proven congruent using SSS.
The triangles can be proven congruent using HL.
The triangles are not congruent.