Area Blue will be;
Area sector with radius 3 unit and angle 60° - Area equilateral triangle with two lengths 2 unit each and angle 60°, the angle they form - 2(Area sector with radius 1 unit and angle 120°)
= (60*9π/360) - ½(4sin60) -2(120π/360)
= ½(3π) - √(3) - ⅓(2π)
= (9π - 4π - 6√(3))/6
= (5π-6√(3))/6 square units.
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