Answers

  • Brainly User
2016-02-16T16:02:10+05:30
Let radii be r and R..so according to the question...R-r=7cm..so R=7+r...so..area enclosed by circular rings=π(R^2-r^2)=286=>22/7(R+r)(R-r)=286=>22/7*(7+r+r)(7)=>286=22*(7+2r)=>286/22=7+2r=>13-7=2r=>6/2=r=3cm= r...so R=7+3=10cm(ans)
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Thnkuu so much and yes I will
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