Solve for θ in the equation cos θ = -0.334 when 0º < θ < 180º. Round your answer to the nearest tenth of a degree.

Answer 1

between 90 and 180 where x is - and y is +
cos^-1 (.334) = 70.5
so 180 - 70.5 = 109.5

Answer 2

Thank you very much! I didn't know the formula.