A meter is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299,792,458 when expressed in the unit m/s, where the second is defined in terms of the cesium frequency ΔνCs (the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom).
And now you know how far a meter is.
A foot is the length of some king’s foot.

Amazing. I’ve learned more about mathmatics today than in 4 years of H.S. 😫
You only went to high school for 4 years? LOSER! I went for six.
Using Trigonometry..
I’m pretty sure there’s a way to calculate that into dog years.
Duh. Everyone knows that. I didn’t know that thing about the king’s foot though