Precalculus Examples

$- 230 °$

Step 1

Find an angle that is positive, less than $360 °$ , and coterminal with $- 230 °$ .

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Step 1.1

Add $360 °$ to $- 230 °$ .

$- 230 ° + 360 °$

Step 1.2

The resulting angle of $130 °$ is positive and coterminal with $- 230 °$ .

$130 °$

Step 2

Since the angle $130 °$ is in the second quadrant, subtract $130 °$ from $180 °$ .

$180 ° - 130 °$

Step 3

Subtract $130$ from $180$ .

$50 °$