Find the area of a circular ring whose external and internal diameters are 20 cm and 6 cm.
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area of cirular ring=π(R^2-r^2)
=π(10^2-3^2)
=π(100-9)
22/7*91=13*22=286
=π(10^2-3^2)
=π(100-9)
22/7*91=13*22=286
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