Please help me out with this question down bellow.

Answer:
a) Triangle A and D
b) Triangle C
Step-by-step explanation:
Congruent: Two shapes are congruent if they have the same size and the same shape. This means that if you could perfectly overlap one shape on top of the other, they would completely match, without any leftover space or gaps.
Similar: Two shapes are similar if they have the same shape but not necessarily the same size. This means that you can enlarge or shrink one shape to obtain the other shape, while preserving the angles and the ratio of corresponding side lengths. For example, two triangles with the same angles but different side lengths are similar.