Trigonometry Examples

$- 216 °$

Step 1

Find an angle that is positive, less than $360 °$ , and coterminal with $- 216 °$ .

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Step 1.1

Add $360 °$ to $- 216 °$ .

$- 216 ° + 360 °$

Step 1.2

The resulting angle of $144 °$ is positive and coterminal with $- 216 °$ .

$144 °$

Step 2

Since the angle $144 °$ is in the second quadrant, subtract $144 °$ from $180 °$ .

$180 ° - 144 °$

Step 3

Subtract $144$ from $180$ .

$36 °$