# Math Help - Finding theta

1. ## Finding theta

thank you for the help everyone

2. Your friend is incorrect. It would appear the only one is 108.42 degrees

cos(108.42)=-0.316

cos(246.4)=-0.400

3. For $cos(\theta)=-.316$ there is only 1 value of theta. If your teacher wants you to find 2 values, then he obviously means as well as $cos(\theta)=.316$, whose value would be 288.4. It's just your answer $+180$.