What are perpendicular lines?
In geometry, a branch of mathematics, perpendicular lines are defined as two lines that meet or intersect each other at right angles (90°).
Perpendicular lines can be found everywhere around us, like at street intersections, in rectangular window panes.
Let's sing!
Perpendicular lines intersect at right angles,
They stand tall, and never do they dangle.
Let's do it!
Give your children opportunities to observe perpendicular lines in objects or places around them, such as a tall tree on the ground, an electric pole on the pavement, railway intersection, corner of two adjacent walls and high buildings.