Blue area is;
Area sector with radius 12 units and angle 30°
- Area sector with radius 6 units and angle 60° - Area triangle with height 6 units and base 6sin120 units.
= (30π*12²/360) - (60π*6²/360) - (½*6²*sin120)
= 12π - 6π - 9√(3)
= 6π-9√(3)
= 3(2π-3√(3)) square units.
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