1. The circumference of circle A is 75 m more than its diameter. If the radius of circle B is 3.5 m more than the radius of circle A, what is the circumference of circle B ?(in m)
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By: anil on 05 May 2019 01.20 am
Let radius of circle A = $$r$$ m Now, circumference of circle - diameter of circle = 75 Acc. to ques, => $$(2 pi r) - (2r) = 75$$ => $$2r (frac{22}{7} - 1) = 75$$ => $$2r imes frac{15}{7} = 75$$ => $$r = frac{75 imes 7}{15 imes 2}$$ => $$r = frac{35}{2} = 17.5$$ m => Radius of circle B = $$17.5 + 3.5 = 21$$ m $$ herefore$$ Circumference of circle B = $$2 imes pi r = 2 imes frac{22}{7} imes 21$$ = $$44 imes 3 = 132$$ m
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