What is the angle of incidence if a reflected wave bounces off a mirror at an angle of 65 degrees?

The density of a liquid could be found by using

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k