AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm with centre O . If ⌊AOB=30 degree. Find the area of the shaded region.

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AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm with centre O . If ⌊AOB=30 degree. Find the area of the shaded region.
06
Oct
AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm with centre O . If ⌊AOB=30 degree. Find the area of the shaded region. AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm with centre O . If ⌊AOB=30 degree. Find the area of [...]
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