and Reference Angles to a Given Angle

1) A coterminal angle is another angle that has the same terminal side as the given angle.
2)The reference angle $\theta_r$ is the acute angle made by the x-axis and the terminal side of the given angle. Solve each step below then click on "Show me" to check your answer. There is a graph at the bottom of the page that helps you further understand graphically the solution to the question shown below.
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