find the area of the shaded region in the figure.
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as we know 90• angle is there , so its a quadrant
formula for area of quadrant = 1/4 π r ^2
area of bigger quadrant ( q1) :
= 1/ 4 * 22 / 7 * 28 ^ 2
= 616 cm ^2
area of smaller quadrant ( q2 ) :
= 1/4 * 22/7 * 21 ^2
= 346.5 cm ^2
area of shaded region = ( q1 - q2 )
= 616 - 346.5
= 269 . 5 cm ^2
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