Trigonometry Examples

$- 252 °$

Step 1

Find an angle that is positive, less than $360 °$ , and coterminal with $- 252 °$ .

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Step 1.1

Add $360 °$ to $- 252 °$ .

$- 252 ° + 360 °$

Step 1.2

The resulting angle of $108 °$ is positive and coterminal with $- 252 °$ .

$108 °$

Step 2

Since the angle $108 °$ is in the second quadrant, subtract $108 °$ from $180 °$ .

$180 ° - 108 °$

Step 3

Subtract $108$ from $180$ .

$72 °$