3 ms·
It wasn't a guarded secret... "Radian" is almost the same word as "radius", and 2pi * radius = circumference = 2pi radians.
by judk 13y ago
It wasn't a guarded secret... "Radian" is almost the same word as "radius", and 2pi * radius = circumference = 2pi radians.
- Jtsummers 13y agoBut unless you take a moment to think about it, that connection isn't so obvious. And in HS, unless math is your interest (and even if it is) there are hundreds of other things running through your brain that are probably more interesting than pondering the relation between the words "radian" and "radius". There are also many other words that people use frequently that they don't realize are connected until much later. And as others have said, HS math (in the US) often presents them as: radians = degrees * pi/180. The calculation has zero relation to the radius of the circle, as presented.