Trigonometry! #9

Geometry Level 2

Hexagon $ABCDEF$ is inscribed in the circle of radius $R$ . $AB=CD=EF=R$ . Points $I$ , $J$ , $K$ are the midpoints of segments $\overline{BC}$ , $\overline{DE}$ , $\overline{FA}$ respectively. Then $\Delta IJK$ is:

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