9. In Fig. 12.84, two concentric circdes with centre O, have radii 21c – InterviewSolution

1.	9. In Fig. 12.84, two concentric circdes with centre O, have radii 21cm and 42cm. If ZAOB 60,find the area of the shaded region. \| Use π =CBSE (AI) 2017] 360°Flg. 12.84
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