The intersections of 12th St., Constitutional Ave., and Pennsylvania Ave. in Washington, D. C. form a triangle. The Old Post Office is wedged in the 12th St. - Pennsylvania Ave. angle of this triangle. If the 12th St. - Constitutional Ave. angle measures 90°, and the Constitutional Ave. - Pennsylvania Ave. angle measures 30°, what is the measure of the angle the Old Post Office is wedged in?
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