find the area of ring shaped region enclosed between two concentric circles of radii 20 cm and 15 cm.
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area of ring=22 (R^2-r^2)/7
=22 (20^2-15^2)/7
=22 (400-225)/7
=22×175/7
=22×25
=550 cm^2
=22 (20^2-15^2)/7
=22 (400-225)/7
=22×175/7
=22×25
=550 cm^2
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