Which rigid motion verifies the triangles are congruent by SAS?

The rigid motion that verifies the triangles are congruent by SAS is reflection.

The angle of reflection simply means the angle that's formed between the normal ray and the reflected ray. It's the line that's perpendicular to the resulting surface at the point of incidence.

According to the law of reflection, the angle of reflection must be equal to the angle of incidence. Therefore, the rigid motion that verifies the triangles are congruent by SAS is reflection.

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Reflection.

Step-by-step explanation:

In the image, we can see that the right angles share a common side. In this common side, we can see that the right angles of the triangles are next to each other (because we have a straight line cut by a perpendicular one) and the same case for the top angle.

Then if we do a reflection over this common line of one of the triangles, the result will be the other triangle.

Then the correct option is a reflection