Definition: Congruousness is a mathematical concept in geometry that refers to two geometric figures being exactly the same distance apart, or having the exact same size. In other words, two shapes are congruent if they have the same shape and size, but not necessarily their angles or dimensions. For example, consider two triangles ABC and DEF. If we draw line segments from A to B and D to E, then triangle ABC is congruent to triangle DEF because they share the same base (AB) and