Matching Pairs Geometry vocabOnline version 3rd grade geometry vocab by Lori Darden 1 ray 2 right angle 3 line segment 4 Intersecting lines 5 Parallel lines 6 line 7 vertex 8 angle straight path that goes on without end in 2 directions they do not cross It has 1 endpoint and goes on without end in 1 direction. forms a square corner they cross the endpoint shared by 2 rays. is part of a line. It has 2 end points. formed when 2 rays share the same endpoint.