What is the reference angle for the angle $theta = (9pi)/7$ ?

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Answer 1 · 2015-04-27T00:54:13

$(9pi)/7 = pi +(2pi)/7$

For an angle, $theta$ , in the Third Quadrant
the reference angle is $theta -pi$ .

In this case the reference angle is $(2pi)/7$

What is the reference angle for the angle theta = (9pi)/7theta = (9pi)/7?