Explanation:
congruent mags that you can take any one of the 2 shapes, twist it or turn, so that it will then be a perfect copy of the other one.
for this both shapes must have the same angles and side lengths. for a triangle we don't need to bother about the same sequence of sides.
when 2 triangles have the exact same side lengths, then automatically they have the same angles.
ABC and XYZ satisfy these criteria.
therefore, they are congruent.