The area of circular ring and enclosed between two concentric circle is 286cm2.Find the radi of 2 circle,if the difference between the radis of circle is 7cm
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22/7*(r^2-7^2)=286
r^2-49=91
r=under root(150)
r^2-49=91
r=under root(150)
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Answer:3cm and 10 cm
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