Find the reference angles corresponding to each of the following angles. It may help if you sketch `theta` in standard position. `theta=-230^@" (ii)" (31pi)/9" (iii)"theta=640^@`

Explanation

To find the reference angles for the given angles, we will follow a systematic approach. The reference angle is defined as the smallest angle that the terminal side of the given angle makes with the x-axis.

### Step-by-Step Solution:

**(i) For θ = -230°:**
1. **Convert the negative angle to a positive angle:**
To find the equivalent positive angle, we can add 360° to -230°.
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