Q. 124.3( 201 Votes )

In Fig. 12.30, OA

Answer :

(i) Since OACB is a quadrant, it will subtend 90° angle at O

Area of quadrant OACB = * r2


= * * (3.5)2


= * * ()2


=


= cm2


(ii) Area of ΔOBD = * OB * OD


= * 3.5 * 2


= * * 2


= cm2


Area of the shaded region = Area of quadrant OACB - Area of ΔOBD


= -


=


= cm2


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