Or you could be an engineer / construction person. Then you know all kinds of measurements.
You carry a measuring tape with you everywhere.
You can spot a 2x4-8 a mile away.

Of course a nail gun needs to be used at a lot closer range.

For all useful purposes, pi = 3⅐

Radians are a neat measurement.
But all my construction squares are lined in degrees, so don't usually get to see them.

What platform do you use to hit a target at 1 mile?
Something easy to get like a winchester 30-30?