M is the midpoint of AD. Triangles A B M and D C M are connected at point M. Sides A B and C D are congruent. The lengths of sid
es B M and M C are 27. What single transformation is required to map one of these congruent triangles onto the other? Reflection Rotation Translation Dilation. ITS REFLECTION !!!!!!
The image attached shows a representation of the problem, there you can observe the congruence between triangles.
Also, using the images you can easily deduct the transformation we need to map one triangle onto the other one, we just need to reflect one triangle across and axis that pass through point M, such line acts like a mirror.