Question

3 lines are shown. A line with points P, R, N intersects a line with points M, R, O at point R. A line extends from point R to point L between angle P R M.
Which angles form a linear pair?

AnglePRL and AngleLRM
AngleORP and AngleMRN
AngleMRN and AngleNRO
AngleLRP and AngleORP

Answer 1

Angle MRN and Angle NRO.

They share the ray RN, and their non-common rays RM and RO are opposite (M–R–O is a straight line), so the two angles are adjacent and sum to a straight angle (a linear pair).