The radii of two concentric circles are 19cm and 16cm,find the area of enclosed with them.
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R = 19cm
r = 16cm
Area of Ring = 22/7 (R²-r²) =[area of two concentric circles ]
(R²-r²) =[R+r] [R- r ] [pplying [a²-b²] =[a+b] [a-b ]
=22/7 (19+16) (19 -16)
=22/7 [35] [3 ]
=22×5 ×3
=22×15
=330 cm² ANS
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