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From a circular card sheet of radius 5 cm, a circular sheet of radius of 4 cm is removed. Find the area of the remaining sheet. (π = 3.14)

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Area of sheet (R) = 5 cm

Radius of circle (r) = 4 cm

Area of remaining part = πR2 – πr2

= π(R2 – r2)

= 3.14(52 – 42)

= 3.14(25 – 16)

= 3.14 x 9

= 28.26 sq. cm

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