what in a classroom illustrates a line,line segment,ray,intersecting lines,and parallel lines?

Answer 1

line = nothing in the classroom goes on forever.

line segment = a line in the tile on the floor, or the top edge of a bulliten board.

ray = nothing in the classroom goes on forever in one direction.

intersecting lines = the letter X or maybe the edges of a computer screen meeting at the corner.

parallel lines = the top and bottom edges of a bulliten board.

Answer 2

Usually it's the Instructor who illustrates these concepts.

HTH ☺

Doug