Give some examples of perpendicular lines inside or outside your classroom

see below

Step-by-step explanation:

Perpendicular lines are where two lines meet at right angles and form a 90 degree corner.

Books have perpendicular lines meeting at corners. The top and side edges.

Desks that have corners, like a teachers desk.

The sides of tiles meet at 90 degree angles.

The top and side of the flag meet at a 90 angle so they would be perpendicular lines.

Books and walls