[" Q19.AB and CD are respectively arcs of two concentric circles of "],[" radii "21cm" and "7cm" and centre O.If "/_AOB=30^(@)" ,find the "],[" area of the shaded region."]

AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm and centre O (see Fig.12.32). If /_AOB=30^(@) find the area of the shaded region.

A B and C D are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O . If /_A O B=30^@ , find the area of the shaded region.

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O (see Fig. 12.32). If /_A O B=30^@ , find the area of the shaded region.

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre(see Fig.12.32).If angleAOB=30^@ ,find the area of the shaded region.

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O. If ZAOB = 30^@ , find the area of the shaded region.

A B and CD are respectively arcs of two concentric circles of radii 21cm and 7cm and centre O. If /_AOB=30o, find the area of the shaded region.

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O (See figwe). If AOB = 30°, find the area of the shaded region.

AB and CD are respectively arcs of two concentric circle of 21 cm and 7 cm radii and centre O (see Fig). If angleAOB=30^(@), find the area of the shaded region.

AB and CD are respectively arcs to two concentric circles of radii 21cm and 7cm with centre O ( See figure), If /_AOB=30^(@) , find the area of the shaded region. (usepi=(22)/(7))

AB and CD are respectively arcs to two concentric circles of radii 21cm and 7cm with centre O ( See figure), If /_AOB=30^(@) , find the area of the shaded region. (usepi=(22)/(7))