Since the angle <math><mstyle displaystyle="true"><mn>180</mn><mi>°</mi></mstyle></math> is in the third quadrant, subtract <math><mstyle displaystyle="true"><mn>180</mn><mi>°</mi></mstyle></math> from <math><mstyle displaystyle="true"><mn>220</mn><mi>°</mi></mstyle></math> .

Subtract <math><mstyle displaystyle="true"><mn>180</mn></mstyle></math> from <math><mstyle displaystyle="true"><mn>220</mn></mstyle></math> .

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