How many lines can you draw to divide a rectangle into two congruent parts?

Assume $ABFD$ is a rhombus and $C$ and $E$ are midpoints of the sides $BD$ and $FD$, respectively. Identify a pair of congruent triangles in the following figure ____.

In the given figure, find the ratio of the area of the larger equilateral triangle to that of the smaller equilateral triangle:

$△$ABC and $△$DEF are _____ .