Find The area of the shaded region
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It is one fourth of a whole circle. So, you can find the area of the whole circle and then divide by 4 to find the area of your quarter circle.
so, area will (A) = 1/4πr^2
here r1 = 28cm and r2 = 21cm
so, here the area of the shaded region will
= {1/4π(r1)^2 - 1/4π(r2)^2}
= 1/4π {(r1)^2-(r2)^2}
= 1/4π {28^2 - 21^2}
= 1/4π (343)
= 269.39 cm^2
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