Just one example: If you want to build something like a cabinet, you would want the sides to be perpendicular to each other, and to the top and bottom. Otherwise the door may not open and close correctly.
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You would use this: ┴
You have to know the slopes of both lines. -- Take the two slopes. -- The lines are perpendicular if (one slope) = -1/(the other slope), or the product of the slopes equals to -1.
When lines met or cross at a right angle are perpendicular lines.
web can use it for making building construction machine.
Triangles do not have parallel lines but as right angles triangles they do have perpendicular lines that meet at 90 degrees.