Question

What is the reference angle of -370 degrees or `(8pi)/3`?

Answer 1

`-370^o -= -10^o`
This angle is `10^o` away from the x-axis
Therefore the reference angle is `10^o`

`(8pi)/3 -=(2pi + (2pi)/3)`
`-= (pi - pi/3)`
This angle is `pi/3` away from the (negative) x-axis
Therefore the reference angle is `pi/3`