what do you need to know about two figures to be convinced that the two figures are congruent
All the sides and all the angles are equal, so these two triangles are congruent. If two figures are congruent, then their corresponding parts are congruent. Let's look at the corresponding parts of triangles ABC and DFE. A triangle has three sides and three angles. If two triangles are congruent, then the sides and angles that match are called corresponding parts.