draw a circle of 5 cm radius on a graph sheet count the square and estimate the area of circular region
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Area of new circle = Area of the ring formed
⇒πR
2
=π(5)
2
−π(3)
2
=25π−9π
=16π,
where R is the radius of the new circle
⇒R
2
=16⇒R=4 cm
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