When you ask the gizmo to show the right triangle what does the hypotenuse side represent

Two rigid transformations are used to map abc to qrs. the first is a translation of vertex b to vertex r. what is the second transformation? a reflection across the line containing ab a rotation about point b a reflection across the line containing cb a rotation about point c

Can someone pls ! pls answer all. no explanation needed..

Ineed no it anyone can see this