Find the area of a ring whose inner and outer radii are 15 cm and 18 cm respectively (Take pie as 3.14)
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Inner radius, r = 15 cm
Outer radius, R = 18 cm
Area of circular ring
= π(R+r)(R-r)
= 3.14(18-15)(18+15)
= 3.14×3×33
= 310.86 cm^2
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