Trigonometry Concepts Test

Remember a radian is just another unit for angles. Just like how yards and feet are both units of length, radians and degrees are both units for angles.

There are 2π radians in   $360^o$ , which means there are  $\pi$ radians in  $180^o$  
 

To switch from degrees to radians, we multiply by  $\frac{\pi\ radians}{180^o}$  

In geometry we learned about two special right triangles: 30-60-90's and 45-45-90's. The next two slides go over these special triangles and their side lengths when they're drawn in a unit circle.

These should be memorized before the quiz. This is me telling you - you need to know this, there will be a question on it.

The important thing to remember is that $\sin\left(\theta\right),\ \cos\left(\theta\right)\ \&\ \tan\left(\theta\right)$  are not always positive. 

I'll go over the mnemonic tool I gave you all once more on the next page.