**Ask a monkey a physics question thread**

[Savy]

Yeah I had to look up radians, I don't remember learning about that at school either. It's clear now how pi is intricately related to the angle of a sector.

And yeah reciprocal is incorrect, I think I can see from mojo's equation solving what the arcsine is relative to the sine. It's what multiplied is to divide.

You won't have done, doesn't get taught till a-level. Is just a way of measuring angles that makes life a bit easier for more maths related things.

Radians are used in math and physics. Degrees and Grads (100 grads = 90 degrees) are more common in engineering.

Grads is essentially a % of vertical-ness scale.

I've never seen someone use gradians in practise.