Hence, as the point P lies on the segment AN, its image R lies on the segment DM, and we have < RNB = < PMC, < MDB = < NAC and < RBC = < PCB (since reflections are congruence transformations and keep angles invariant - non-directed angles at least).
Kaya, tulad ng sa punto P kasinungalingan sa segment ISANG, ang imahen R kasinungalingan sa DM segment, at kami ay may <RNB = <PMC, <MDB = <NAC at <RBC = <PCB (since reflections ay pagkapareho transformations at panatilihin angles invariant - hindi itinuro angles ng hindi bababa).