Question

question 12 triangle a is congruent to triangle b. what must be true about their side lengths and angles? they have equal perimeters only. they have equal side lengths and equal angles. one is a mirror image, so they are not congruent. their angles are equal, but sides can be different. question 13 two triangles have the same angle measures, but different side lengths. what does this tell us

Explanation:

Congruent triangles have identical side - lengths and angle - measures. This is the definition of congruence in geometry.

Answer:

They have equal side lengths and equal angles.