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As shown in the figure, radius of the given circle is 21 cm and ∠AOB = 120°. Then find the area of segment AYB.

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Given radius of area = OA = OB = 21 cm 

Now3 the angle at centre for the sector 

Formula for area of sector = \(\frac{x}{360}\) x πr2 

\(\frac{120}{360}\) x \(\frac{22}{7}\) × 21 × 21 = 22 × 21 

= 462 cm2 ……………………… (1)

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