that they are congruent. to prove they are congruent you must use one of the congruent triangle postulates which are SSS, SAS, ASA, AAS and HL. side side side means that if all sides are congruent than the triangle is congruent. side angle side says the same about a congruent included angle with two congruent sides. angle side angle means a congruent included side in between two congruent angles. angle angle side says that two angles and an excluded side means the triangles are congruent. and hypotenuse leg means that if the hypotenuse and one leg are congruent than the whole triangle is congruent. (this only works on right triangles)
