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Sketch a unit circle with an angle that measures radians.

  1. Approximately how many degrees is radians?

    Notice that radians .
    So it's a little less than .

    Unit Circle, line segment from center to point in fourth quadrant, center shaded sector, from positive, x axis, to line segment, is labeled  6 radians.

  2. Using only your diagram, estimate the sine of radians.


    Added to diagram, red vertical segment, from end of radius, in fourth quadrant, to positive x axis.