Originally Posted by

**Punch** Okay I have been doing trigo sums over the past few days...

And I have also learnt that if solving for angle X gives me an answer of lets say, $\displaystyle -10^\circ$, I would need to add "1 round" to $\displaystyle -10^\circ $to get my answer since I can't have a negative angle.

I would like to clarify if the value of "1 round" is related to the domain of the question.

If it's true, two example would be this.

**Example one**

Angle $\displaystyle X$ found to be $\displaystyle -10^\circ$. Question domain is $\displaystyle 0^\circ < X < 360^\circ$

So adding 1 round = adding $\displaystyle 360^\circ$

Therefore, answer = $\displaystyle 350^\circ$.

**Example two**

Angle $\displaystyle X$ found to be $\displaystyle -10^\circ$. Question domain is $\displaystyle 0^\circ< X < 180^\circ$

So adding 1 round = adding $\displaystyle 180^\circ$

Therefore, answer = $\displaystyle 170^\circ$.