Today is 3-14, so let's celebrate mathematics and test our math skills for a little fun (and maybe some merit.)
I'll start:
√-1 2^3 ∑ πPost your fun equations if you have them.
Disclaimer: I'm not a merit source, but I do have a couple of dozen sMerit burning a hole in my pocket.
Disclaimer 2: Yeah, I know, we Americans write dates backwards, get over it. Furthermore, if it wasn't for us backwards Americans there wouldn't be a Pi day. You're welcome.

Area, a = Length (l) × Breadth (b) ; unit is m^2
Volume, v = Length (l) × Breadth (b) × Height (h); unit is m^3
Sometimes it is difficult to recall or remember some formula or equation once you are done with school because you won't be studying and practicing unless the person want to further..., this is really interesting op.