Question

The area of a circular ring enclosed between two concentric circles is 286cm^2. Find the radii of the two circles given that their difference is 7cm

Answer 1

π(R²-r²)=286
π(R+r)(R-r)=286
22(R+r)=286
(R+r)=13
on solving the equation simultaneously
2R=20
R=10
and hence r=3

Answer 2

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