The area enclosed by the circumference of two concentric circles is 423.5 sq. cm,if the circumference of outer circle is 132 cm,find the radius of ...
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circumference =2pi r
=2×22/7×r=132
=r=132×7/2×22
r=21
=2×22/7×r=132
=r=132×7/2×22
r=21
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circumference =132
than u get radius of outer cicle
area of big circle -area of small circle=432.5sq
than u get radius of outer cicle
area of big circle -area of small circle=432.5sq
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