Question

A ........... divides a two dimentional shape into two congruent shapes.

Answer 1

A rectangle is a two - dimensional shape, so let me explain using it as an example.

The diagonal of a rectangle divides the rectangle into two triangles that are congruent (the same size and shape.)

Another example is parallelogram; the diagonal of a parallelogram also divides the figure into two separate shapes that are congruent.

Hope this helps!