The triangle ∆BCA is congruent to triangle ∆YZX, that is ∆BCA ≅ ∆YZX.
The quadrilateral MNPQ is congruent to quadrilateral RSTU, that is MNPQ ≅ RSTU
Congruent shapes refer to figures that have the same shape and size. When two shapes are congruent, it means that one shape can be transformed into the other through a combination of translations (moving in a particular direction without changing orientation), rotations (turning around a center point), and reflections (flipping across a line). Essentially, if you can move, turn, and flip one shape to make it coincide exactly with another, then the two shapes are congruent.
Thus, the triangle shape ∆BCA can be transformed to become ∆YZX by rotation, while the quadrilateral MNPQ can become RSTU through a combination of translations.