Question

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O. if angle AOB=30 degree find the area of shaded region

Answer 1

Answer:

Area of the shaded region = Area of sector OAEB - Area of sector OCFD

=

*

* (21)2 -

*

* (7)2

=

*

[(21)2 – (7)2]

=

*

[(21 – 7) (21 + 7)]

=

=

cm2

Answer 2

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