# Easy way to remember pi

No need! Just remember the fundamental theorem of Physics,$$\pi = e = \sqrt{g}$$
e = energy?

g = gravity?

etotheipi
Gold Member
2020 Award
$$e = \sum_{n=0}^\infty \frac{1}{n!} = \lim_{m\rightarrow \infty} \left(1+ \frac{1}{m} \right)^m \approx 2.718281828459045$$whilst ##g## is the gravitational field strength on the Earth's surface, which as pointed out by @Infrared must in this case be the dimensionless value of that quantity when expressed in the SI, to maintain dimensional homogeneity.

I might take this opportunity to mention that, in case anyone didn't notice, the fundamental theorem of Physics isn't particularly fundamental. Or a theorem, for that matter.

Last edited:
member 587159
Mark44
Mentor
e = energy?

g = gravity?
e is the Euler number, the base of the natural logarithm
g is the acceleration due to gravity (about ##9.81 \frac{\text m}{\text{sec}^2}## or about ##32.2 \frac{\text {ft}}{\text{sec}^2}##)

There's an old poem about it.

Sir, I bear a rhyme excelling
In mystic verse and magic spelling
Celestial sprites elucidate
All my own striving can't relate

Just count the letters in each word.

BvU and DaveC426913
DennisN
2020 Award
I remember how to press π on my calculator. Pi is ca 3 if my memory serves me.

BillTre and Keith_McClary
Astronuc
Staff Emeritus