Find the area of circular ring ,if external and internal radii arr 20cm and 6cm respectively solution
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area= π(R)2 -π(r)2
=π( 20×20 - 6×6)
=22/7 ×364= 1144 cm2
=π( 20×20 - 6×6)
=22/7 ×364= 1144 cm2
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