It’s weird to picture, but every point on the circle has a tangent vector which is, by definition, at a right angle to the radius vector, which is what the sides of that larger pie piece both are.

You have to think of the infinitesimally small point where the two meet.

It’s crazy how kind they are.

I like the part where your every move is screencapped definitely not at all “uploaded”

Anti-open(source), anti-open(standards) l, anti-consumer, anti-planet, anti-repair, anti-honest. What else do you need?

Sooo, an open source Cronometer.

… which is a really good app btw. Been using it for 10 years.