For p, q ? S^1, the unit circle in the plane, let d_a(p, q) = min{|angle(p)...

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For p, q ? S^1, the unit circle in the plane, let
d_a(p, q) = min{|angle(p) ? angle(q)| , 2? ? |angle(p) ?angle(q)|}
where angle(z) ? [0, 2?) refers to the angle that z makes with thepositive x-axis.
Use your geometric talent to prove that d_a is a metric on S^1.

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