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Question

In the figure, OACB represents a quadrant of a circle. The radius OA=3.5cm,OD=2cm.
The area of the shaded portion is
208318_34adbc239ac34e99a18c521a66c8cdcc.png

A
613 cm2
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B
6.13 cm2
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C
316 cm2
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D
3.16 cm2
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Solution

The correct option is B 6.13 cm2
Area of quadrant OACB =14πr2
=14×22772×72
=9.63cm2
Area of OAD=12×OA×OD
=12×3.5×2
=3.5cm2
Area of the shaded portion =(9.633.5)cm2
=6.13cm2

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