In the given figure, two concentric circles with centre 'O' have radii 21 cm
are of the corresponding
22
and 42 cm. IF AOB = 60°. Find the area of shaded region =
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Answer:
Radius of bigger circle = 42 cm
Area of major sector in bigger circle =
360
θ
πr
2
(θ being the angle subtended by major arc)
Area of major sector in bigger circle =
360
300
π(42)
2
Area of major sector in bigger circle = 4620 cm
2
Radius of smaller circle = 21cm
Area of major sector =
360
θ
πr
2
(θ being the angle subtended by major arc)
Area of major sector =
360
300
π(21)
2
Area of major sector = 1155 cm
2
Area of shaded portion = 4620−1155 = 3465 cm
2
Step-by-step explanation:
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