What about drawing a perpendicular to a line that’s already curved? That’s a different beast—a normal line in calculus. Don’t try that with a protractor unless you’re feeling masochistic. Stick to straight lines for now.
And here’s a pro tip: never use a ruler that’s bent. I learned this the hard way while building a birdhouse. The roof leaned like a drunk duck at a wedding. Trust your tools, but trust your eye more.
Finally, if you’re drawing a perpendicular line on a blackboard (are those still a thing?), ask a friend to stand behind you and check. Two pairs of eyes are better than one, especially when chalk dust fills the air like a scene from Dead Poets Society.
