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Find the difference of the areas of a sector of angle 120° and its corresponding major sector of a circle of radius 21 cm.

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Find the difference of the areas of a sector of angle 120° and its corresponding major sector of a circle of radius 21 cm.
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Solution:

Given that, radius of the circle (r) = 21 cm and central angle of the sector AOBA (θ) = 120°

Hence, the required difference of two sectors is 462 cm²

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