Question

Find the reference angles corresponding to each of the following angles. It may help if you sketch $\theta$ in standard position.

$\theta ={640}^{\circ }$

Answer 1

$\theta ={640}^{\circ }$

Here, $\theta =2\times {360}^{\circ }-{80}^{\circ }$

Hence, the reference angle is ${80}^{\circ }$.

Ans: 80