Question

write the formula to find area of rings

Answer 1

FORMULA TO FIND AREA OF CONCENTRIC RINGS =pi ( R^2 - r^2)

where R = larger radius

and r = smaller radius

Answer 2

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$Area \: of \: ring \\ = \pi \: R {}^{2} - r {}^{2} \\ = \pi(R {}^{2} - r {}^{2} ) \\ = \pi( T+ r)( R-r )$