Using rigid motion, both of these triangles will be congruent. The reason is because rigid motions include reflections, translations, and rotations.
None of these transformations will affect the size or shape of the figure, therefore keeping them congruent.
Missing information, you didn't provide the matrix
1. 6
2. The initial depth of the water before any time has passed
3. The depth of the water per hour
4. y= 3/2x+6