Question

AB and CD are two diameters of a circle (with center O) perpendicular to each other and OD is the diameter of the Smaller cirlcle.If OA=7cm,find area of shaded region.​

Answer 1

Step-by-step explanation:

Radius of bigger circle r1=OA=7

Radius of smaller circle r2=2r1

                                             =27

Area of the bigger circle C1=πr12

                                                =722×7×7

                                                =154cm2

Area of the semicircle =2154cm2

                                      =77cm2

Area of the smaller circle C2=πr22

                                                =722×27×27

                                                =277

Area of the unshaded triangle △ABC=21×AB×OC

                                                                  =21×14×7

                                                                  

Answer 2

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