ConceptProblems Based on Areas and Perimeter Or Circumference of Circle, Sector and Segment of a Circle

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#### Question

In Figure 3, two concentric circles with centre 0, have radii 21cm and 42 em. If ∠ AOB = 60°, find the area of the shaded region. [use π=22/7]

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#### Reference Material

Solution for concept: Problems Based on Areas and Perimeter Or Circumference of Circle, Sector and Segment of a Circle. For the course CBSE