Question

How many of these and which of them are of congruent figure

A. A reflection across the line y = -3 followed by a 270o clockwise rotation about the origin.
B. A reflection across the y = -x followed by a dilation by scale factor of 3 about the origin.
C.A translation 4 units left and 5 units up followed by a horizontal stretch by a factor of 5.
D. A translation 8 units up followed by a horizontal compression by a factor of ½.

Answer 1

If by this you mean which of these preserve congruence, then A and B preserve angular congruence, meaning the angles would be the same, but side lengths may vary. C and D deform the triangle and thus change the angles of the triangle, destroying congruence.