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Find the area of a ring whose outer and ...

Find the area of a ring whose outer and inner radii are respectively 20 cm and 15 cm

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Outer radius R = 20 cm
Inner radius r = 15 cm
`:.` Area of ring `= pi (R^(2) - r^(2))`
`rArr` Area of ring `= (22)/(7) [(20)^(2) - (15)^(2)] = (22)/(7) (400 - 225) = (22)/(7) xx 175 cm^(2)`
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