two circles have a common centre and different radii. the radius of the bigger circle is 20m and the radius of the smaller circle is 10m.find the area of the portion between the circles (take π=3.14)
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two circles have a common centre and different radii. the radius of the bigger circle is 20m and the radius of the smaller circle is 10m.find the area of the portion between the circles (take π=3.14)
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