Answer :

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

Area of quadrant OACB = * r^{2}

= * * (3.5)^{2}

= * * ()^{2}

=

= cm^{2}

(ii) Area of ΔOBD = * OB * OD

= * 3.5 * 2

= * * 2

= cm^{2}

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

= -

=

= cm^{2}

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