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Area of shaded region = Area of circle + Area of ΔOAB - Area of sector OCDE
= πr2 + √3/4 (side)2 - θ/360° × πr2
= π(6 cm)2 + √3/4 (12)2 - 60°/360° × π (6 cm)2
= 36π cm² + 36√3 cm² - 6π cm²
= (30π + 36√3) cm²
= (30 × 22/7 + 36√3) cm²
= (36√3 + 660/7) cm²
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