It’s fun to, what’s that word, oh yes, remember. It’s fun to remember things.
Well, the opposite is certainly no fun at all.
I always remembered it as “concave bends in because it looks like the entrance to a cave,” and convex is just… the other one.
Vexing to remember, is it not?
Really, the second one doesn’t always work either if a light is connected to two switches.
The way I remember things like root words is bizarre at best. For example, the root word “cad”. I think of “Cadicarus”, who is a YouTuber. His YouTube name sounds a lot like “Kid Icarus”, which is a video game takes place in the clouds, a place you can easily FALL from. So, “cad” means “fall”. Strangely enough, this method seems to work well for me.
concave down like a frown, concave up like a cup!
In german we have:
Mädchen hat sex – Bauch konvex
Mädchen ist brav – Bauch konkav
Girl has sex – stomach convex
Girl is well-behaved – stomach concave