1. The difference between the radii of the bigger circle and smaller circle is 14 cm and the difference between their areas is 1056 cm . Radius of the smaller circle is






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  • By: anil on 05 May 2019 01.54 am
    Let the radius of bigger circle be $$R$$ and of smaller circle be $$r$$ => $$R - r = 14$$ ----------Eqn(1) Also, $$pi R^2 - pi r^2 = 1056$$ => $$(R-r) (R+r) = frac{1056}{pi}$$ => $$R + r = frac{1056 * 7}{22 * 14}$$ => $$R + r = 24$$ -----------Eqn(2) Subtracting eqn(1) from (2), we get : => $$2r = 10$$ => $$r = 5$$ cm
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