find the area of a ring shaped region enclosed between two concentric circles of radii 20cm and 15 cm.
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Area of outer circle=πr^2 = π×20^2 = 400π cm^2
Area of inner circle= π×15^2 = 225π cm^2
Area of ring= 400π-225π = 175π = 549.78 cm^2
Area of inner circle= π×15^2 = 225π cm^2
Area of ring= 400π-225π = 175π = 549.78 cm^2
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